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At it vs In it

at it

1. hard at work exerting oneself:

  • He never gives himself any rest; he’s always at it.

2. doing smth., especially repeatedly, of which the speaker disapproves:

  • Those children lighting fires in the park. So they are at it again, are they?

3. arguing or quarrelling, especially when this happens repeatedly:

  • There they are at it now, with their caterwauling, squealing, all together.

4. (euph., sl.) indulging in sexual intercourse:

  • The couple next door have been at it all night.

in ittaking part in an activity; engaged in smth.:

  • There is no money in boxing. Those of us who started it many years ago are really not in it for the money.