be at it

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be at it

1. To partake in an action, activity, or pursuit vigorously, exhaustively, or determinedly. I studied really hard for this test; I was at it all night. I wish those dogs would quit barking, they've been at it since the sun came up!
2. slang To engage in sexual intercourse. I can always hear when the neighbors are at it. It's really embarrassing!
References in periodicals archive ?
Councillor Ian Mollison voted in favour of the proposal but said: "I am sure it's very tasteful but you might think a local resident has been at it with a tin of Dulux.