be at (someone or something)
1. To be located in a particular place. Where are you at? I just looked inside the restaurant, but I didn't see you. I'm at the main entrance—where are you?
2. To occur at a specific time. According to the tickets, the concert is at 8:00, but I'm sure the headliner won't go on that early.
3. To nag or pester someone to do something. My mom is always at me about cleaning my room—it's so annoying.
4. To be working on something determinedly or persistently. I've been at this problem for hours and still haven't found a solution.
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.