do in

British  

verb

1. to murder or kill

2. to exhaust

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do in Idioms  

1. Tire out, exhaust, as in Running errands all day did me in . [ Colloquial ; early 1900s] Also see done in .

2. Kill, as in Mystery writers are always thinking of new ways to do their characters in . [ Slang ; early 1900s] Also see def. 4.

3. Ruin utterly; also cheat or swindle. For example, The five-alarm fire did in the whole block , or His so-called friend really did him in . [First half of 1900s]

4. do oneself in . Commit suicide, as in She was always threatening to do herself in . [ Slang ; first half of 1900s]

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Example Sentences

See Examples For:

do in

And you can force yourself to do things that you don’t want to do in the moment.

From Slate ● Oct. 17, 2026

And I should make it clear, as I tried to do in the film, that what we hear from him are actual audio recordings of him.

From Salon ● Oct. 16, 2026

"What I have to do in my role is try and repair bridges so that the support comes back," Burnham told the British parliament.

From Barron's ● Oct. 14, 2026

"Me and my team are going to think really hard about what we can do in the future."

From BBC ● Oct. 13, 2026

It is also called the tonic, and it's the "do" in "do-re-mi."

From "Understanding Basic Music Theory" by Catherine Schmidt-Jones and Russel Jones

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