Caution vs Fire in the hole

When to use each in English, with meaning, register, and examples.

Caution

Top 2,000 (common)C1noun

Fire in the hole

SlangBeyond 10,000 (less common)
Most formal: CautionMost common: Caution
 CautionFire in the hole
Pronunciation🇬🇧 /["/ˈkɔːʃn/"]/🇺🇸 /["/ˈkɔːʃn/"]/🇬🇧 //faɪə(r) ɪn ðə həʊl//🇺🇸 //faɪər ɪn ðə hoʊl//
MeaningBe careful.Warning that something explosive is about to happen.
ExampleCaution is advised when driving in heavy rain.The soldier yelled, 'Fire in the hole!' before tossing the grenade.
RegisterNeutralSlang
How commonTop 2,000 (common)Beyond 10,000 (less common)
CEFR levelC1-
Part of speechnoun
Collocationsconsiderable, extra, extreme, exercise, take, use, with caution, err on the side of caution, the need for caution, sound a note of caution, formal, get off with, receive, give somebodyshout fire in the hole, announce fire in the hole, ready for fire in the hole
Antonymscarelessness, recklessness-
Common mistakesConfused with 'cause' — learners may use 'caution' incorrectly as a reason., Using 'caution' as a verb — 'caution' is primarily a noun., Incorrectly spelling 'caution' as 'cautiont'.Used in formal contexts where it sounds out of place., Confused with actual firefighting terms., Misused as a general expression without danger.
Usage notesUse 'caution' when advising someone to be careful. It is appropriate in both spoken and written contexts, but can sound slightly formal in casual conversations.Used informally, often in military contexts or when joking about throwing something dangerous. Not for formal situations.

See it in real clips

Caution
Fire in the hole

Frequently asked questions: Caution vs Fire in the hole

What's the difference between Caution and Fire in the hole?

Caution: Be careful. Fire in the hole: Warning that something explosive is about to happen.

Which is more formal: Caution and Fire in the hole?

Caution is the most formal of these.

Which is more common: Caution and Fire in the hole?

Caution is the most common in everyday English.

Can you show an example of each?

Caution: Caution is advised when driving in heavy rain. Fire in the hole: The soldier yelled, 'Fire in the hole!' before tossing the grenade.

Can I use Caution and Fire in the hole interchangeably?

Not always. Caution and Fire in the hole are related and overlap in some contexts, but they differ in register, how common they are, and usage, so swapping one for another can change the meaning or tone. Check the differences above before substituting.

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