From Longman Dictionary of Contemporary Englishbe at it againbe at it againinformal if you say that someone is at it again, you mean that they are doing something you disapprove of, which they have done before She’s at it again, interfering in other people’s business. → at
Examples from the Corpus
be at it again• It is a matter of great importance, on which the Government are at it again.• Lydia's imagination was at it again.• Now they are at it again.• That Arkansas poultry producer was at it again.• The guys are at it again, discussing my private parts in public.• The parakeets were at it again, their squawks rising like shifting clouds.• They were at it again within two minutes of the restart, as Shaun Bartlett fired over from close range. 