Keep upkeep up & keeps up keeping up kept up kept up 1. keep... up p.v. When you keep an activity up, you continue doing it. Leopards can run extremely fast, but they can't keep it up longer than a minute or two. I told you to stop doing that. If you keep it up, I'm going to get angry. 2. keep up (with) p.v. When you are in a group that is studying, working, and so on, and you are able to learn or work at the same rate as the others, you keep up or keep up with the group. Fall behind is the opposite of keep up. Lydia missed several days of school last month, and now she's having a hard time keeping up with the rest of the class. The assembly line was going so fast that no one could keep up. 3. keep up (with) p.v. When you keep up or keep up with people or things that are moving, you are able to move at the same rate. Fall behind is the opposite of keep up. Bob walks so fast that it's hard to keep up with him. The wounded soldiers couldn't keep up with the rest of the army. 4. keep up (with) p.v. When you can understand and respond to a situation that is changing, you are able to keep up with the situation. Computer technology is changing so fast. How can anyone keep up with it? Jane always has some new idea. I can't keep up with her. 5. keep... up p.v. When people or things keep you up, they prevent you from going to bed, or if you are in bed, they prevent you from falling asleep. Ned just would not leave last night; he kept me up until 2:00 in the morning. That noisy party across the alley kept me up all night.
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