What does "do in" mean?
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Tire out, exhaust, as in
Running errands all day did me in. [Colloquial; early 1900s] Also see
done in.
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Kill, as in Mystery writers are always thinking of new ways to do their characters in. [Slang; early 1900s] Also see def. 4.
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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]
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do oneself in. Commit suicide, as in She was always threatening to do herself in. [Slang; first half of 1900s]
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