push at (someone or something)
To apply continuous or repeated pressure on someone or something. You can push at that thing all you want—there's no way you'll get it to budge. I'm moving, I'm moving! You don't have to keep pushing at me!
push at someone or something
to apply pressure to and try to move someone or something. She pushed at him, trying to get him to get out of the way, but he wouldn't budge. Mary pushed at the door, trying to open it against the wind. There is no need for you to push at me so hard.