do the deed

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do the deed

1. To perform or undertake any given action, usually implied to be unpleasant, unsavory, or illegal. I couldn't stand the idea of watching them put down my pet dog, so John went alone to do the deed. The mob boss waited to hear whether the assassin he'd hired had done the deed.
2. slang To have sexual intercourse. Teenagers are under a huge amount of pressure from their peers to do the deed before they feel ready or really want to.
See also: deed
References in classic literature ?
Or perhaps I did the deed in a fit of despair (though it may be foolish of me to think so)?