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1. verb To shove, thrust, or press someone or something forcibly upward. A noun or pronoun can be used between "push" and "down." Push up the hatch so I can access the control panel. I pushed her up so she could scale the wall.
2. verb To advance something to an earlier status of production. Often used in passive constructions. A noun or pronoun can be used between "push" and "up." The project has been pushed up so it can be released before Christmas. The boss wants us to push the latest software patch up, but I don't think we can finish it any sooner.
3. noun An exercise in which one lies flat on one's stomach, pressing one's body up with one's hands while one's toes or knees remain on the ground. Typically spelled with a hyphen or as a single word. If you can't afford to go to a gym, push ups are a great all-around upper-body workout. I can't do normal push-ups, so I just do them on my knees. I really need to start working out—I can't even do a single pushup!
push someone or something up
to raise or lift someone or something. Jake is sliding down again. Push him up. Push up the window, please.