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Related to at it: Have at it
1. Involved 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 Engaging in sex. I can always hear when the neighbors are at it. It's really embarrassing!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
Vigorously pursuing an activity, especially a fight, but also sex or some other activity. For example, Whenever they play bridge they really go at it (fight), or The new job keeps Tom at it day and night (works hard), or In the spring the dogs are always at it (sex). Shakespeare used this seemingly modern idiom for "fighting" in Troilus and Cressida (5:3): "They are at it, hark!" [Late 1500s]
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
at itengaged in some activity, typically a reprehensible one.
1993 G. F. Newman Law & Order Oh, don't take me for a complete idiot, Jack. I know you're at it.
Farlex Partner Idioms Dictionary © Farlex 2017
Engaged in verbal or physical conflict; arguing or fighting: The neighbors are at it again.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.