To communicate clearly and effectively, choose words that can mean only one thing to the person hearing them. Prefer the plain word to the clever one, spell any word with a sound-alike, say each number in a single agreed form, drop terms only you know, and when asked to repeat, use exactly the same words again.
What makes a sentence clear rather than just correct?
A sentence is clear when the listener can take only one meaning from it. A correct sentence can still be unclear: "cut the blue wire" is accurate when there are two blue wires, yet it leaves the listener to choose. Clarity is judged from the listener's side, by counting how many readings the words allow.
Correctness and clarity come apart all the time. "Press the button that says right" is grammatical and true. Spoken aloud, it could mean the button labelled RIGHT, the one labelled WRITE, the one labelled RITE, or the button on the right-hand side. All four readings are reasonable. The sentence is correct and useless.
Clear sentences tend to share a few features. They name one specific thing. They give the detail that separates it from similar things. They avoid words that change meaning depending on context, such as "it", "this" or "the other". And they keep the important word somewhere the listener will notice it, usually near the end where it lands with weight.
A good test is to imagine the listener has a list of every possible thing you could mean. A clear sentence crosses out all but one. An unclear one leaves two or more standing, and the listener picks, often wrongly. On a bomb in Bomb Appétit, the wrong pick is a strike. At work it may be the wrong file sent to a client, discovered a day later.
Words that sound alike and how to spell them out
When a word has a sound-alike, spell it letter by letter and do not rely on the spoken word at all. Say "spelling" first so the listener knows letters are coming, then give each letter at an even pace. For letters that blur, such as B, D and P, use a spelling alphabet word or an agreed example word.
The Word Grid module is built around this problem. Its display shows one word, and its six buttons each carry another. The display words are kitchen words chosen because each has a sound-alike spelled differently: FLOUR and FLOWER, THYME and TIME, STEAK and STAKE, PEAR, PAIR and PARE. The button words sound like talk between players: WAIT and WEIGHT, NOT and KNOT, NOW and KNOW, WHICH and WITCH. The manual tells Experts to ask the Defuser to spell every word.
Spelling works because it changes what is being heard. "Pear" said aloud has three possible spellings. "P, E, A, R" has one. The cost is a few extra seconds, and on a module where one wrong press is a strike, that trade is easily worth it.
Letters themselves can blur, especially over a call. B, D, E, P, T and V share a sound. M and N are close. A spelling alphabet, the kind pilots and radio operators use, gives each letter a whole word so it cannot be misheard. If your group does not know one, agree simple example words at the start: "B for bread, D for dough".
Spelling also helps the person reading. A Defuser who spells is forced to look at each letter, which catches misreads like WATT for WHAT before they cross the gap.
Saying numbers clearly: digits, counts and positions
Say every number in one fixed form, and say which kind of number it is. A digit, a count and a position are different things, and the listener needs to know which one is coming. "Last digit seven", "three red wires" and "the third wire" each carry the number with a word that says what it measures.
Numbers cause trouble in three ways. They sound alike in pairs, like fifteen and fifty, or thirteen and thirty. They can be said several ways, like "oh" and "zero". And they can be a count or a position, which "three" alone does not tell you.
For digits, read them one at a time. A serial number like an invented "AB3E57" goes out as "A, B, three, E, five, seven", not "fifty-seven". The manual's edgework appendix notes that the serial is six characters with a digit at the end and never uses the letters I or O, so a round character is always zero. That means "zero" is always right and "oh" never is.
For counts, put the number before the noun: "Two batteries." For positions, use ordinals and say where you count from: "Third wire from the top." The Wires manual counts wires from the top starting at one, so a Defuser who uses that convention matches the Expert's page.
Mixing the two is the classic slip. "Cut three" could mean the third wire or three wires. "Cut the third wire" cannot.
Before and after: eight sentences from real modules
The lines below are invented examples built on real module layouts. Each pair shows a sentence that allows more than one reading beside a version that allows only one.
- Word Grid. Unclear: "The display says time." Clear: "Display, spelling: T, H, Y, M, E."
- Word Grid. Unclear: "Press right." Clear: "Press the button at bottom left. It's spelled R, I, G, H, T."
- Word Grid. Unclear: "There's a 'what' up top." Clear: "Top right button: W, H, A, T. Top left: W, A, T, T."
- Passcode. Unclear: "First wheel has a bunch of letters, like a B and some others." Clear: "First wheel, six letters: B, C, F, G, H, S."
- Passcode. Unclear: "Turn it to bread." Clear: "Set the wheels, left to right: B, R, E, A, D. Then press submit."
- Wires. Unclear: "Cut the blue one." Clear: "Cut the second wire from the top. It's blue."
- Wires. Unclear: "There are a few reds." Clear: "Six wires. Exactly two are red."
- Wires. Unclear: "Serial's odd, I think." Clear: "Serial's last digit is seven."
The Passcode examples follow the module's own method. Its page asks the Defuser to read all six letters on the first wheel, then crosses out every listed word that does not start with one of them, wheel by wheel, until one word is left.
How clear is clear enough when the clock is running?
A sentence is clear enough when the listener can act on it without asking and without guessing. Once it names one thing, gives the deciding detail and states one action, stop refining and say it. More polish costs time. If the listener still needs more, a quick answer to their question is cheaper than a long pause beforehand.
Under a timer, perfection has a price. Each strike in the game speeds up the countdown, and needy modules interrupt at random. A speaker who spends ten seconds composing the ideal sentence loses those ten seconds whether or not the sentence was better.
The opposite failure is shorthand so compressed it needs decoding. "Two-B, cut" may be clear to the person who said it and to nobody else. The middle ground is short sentences built from full words in a fixed order.
One way to find the line is to listen for questions. If the listener never asks anything, you might be over-explaining. If they ask after every sentence, you are under-explaining. An occasional question means you are about right.
Jargon, abbreviations and other words only you know
Jargon is any word the speaker knows and the listener may not. It includes technical terms, abbreviations, private nicknames and team slang. Under pressure, people fall back on their own vocabulary, so check before a task which terms you share, and use the listener's words, or the manual's, rather than your own.
In a game, jargon grows fast. A team that has played a few rounds develops nicknames: "the beehive" for a glyph, "the kebab" for a port. Those work only for people who were there when they were coined. A new player hears nonsense.
The manual offers a shared vocabulary that everyone can check. The Glyph Keypad page describes each glyph as an outer shape with a mark inside, and labels it that way. The edgework appendix gives each port a name and a short description, such as "two round sockets side by side" for the twin port. Indicators carry three-letter labels like YUM, ZAP and MSG. Using those names means the Expert can look them up, and the post on agreeing on names for symbols and colors explains how to settle on the rest.
Abbreviations deserve special care, because they often sound like other things. "MSG" said quickly could be heard as "message". Spell abbreviations letter by letter the first time, and do not invent new ones mid-task. For a longer list of words that trip people up, see which words fail at the bomb.
The clarity mistake: rephrasing when asked to repeat
When asked to repeat, say exactly what you said before, in the same words and the same order. Rephrasing feels helpful but gives the listener a second version to compare with the first. They now have to work out whether the two mean the same thing. Same words let them fill in the part they missed.
The urge to rephrase comes from a good place. The speaker assumes the first version was unclear and tries to improve it. But usually the listener heard most of it and missed one word. A new sentence makes them start over.
Rephrasing can also introduce a contradiction. "Cut the third wire" becomes, on repeat, "the one in the middle". On a five-wire panel, those are the same. On a six-wire panel, there is no single middle wire, and the listener is stuck.
If you truly think the first version was unclear, say so: "Let me say that differently." Then give the new version and drop the old. That signals that the listener should discard the first and avoids two live versions.
Clear words are half of a clear instruction; the other half is order. Giving clear instructions with the condition first covers that, and asking clarifying questions before you act covers the listener's side. The FAQ answers the practical questions, such as whether you can print the manual, if you want to test these sentences on a real bomb.