be at (one)

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be at (one)

To nag or pester one to do something. My mom is always at me about cleaning my room—it's so annoying. I've been at Tom to finish that report all week, so he had better be close by now!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

be at

v.
1. To be located somewhere: The hotel is at the center of town. I am at the corner of 11th Street and Third Avenue.
2. To take place at some given time: Our meeting is at noon. The movie is at 8:00, so we've got plenty of time for dinner.
3. To be busy trying to accomplish something; keep at. Often used with it: I have been at this interminable project for weeks now.
4. To remind someone regularly about something or to do something: He's been at me about the book he lent to me.
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.