Question 1

What does "let one off" mean?

Accepted Answer

(British vulgar slang) To pass gas audibly or noticeably.

Question 2

How do you use "let one off" in a sentence?

Accepted Answer

Someone let one off in the lift and everyone pretended not to notice.

Question 3

Is "let one off" formal or informal?

Accepted Answer

"let one off" is register-neutral — appropriate in both casual and formal contexts. Crude British slang. Used humorously among friends. The 'one' here is a semi-euphemistic pronoun replacing an explicit noun. Completely inappropriate in formal contexts. Learners should understand it but avoid using it.

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