1. Process of approaching thermal equilibrium after turn on.
2. Exercising in preparation for strenuous activity; SYN. tune-up, prolusion. warm up
3. When you do light exercises before playing a sport or exercising with greater effort, you warm up. When performers play musical instruments or sing just before a performance in order to be ready, they warm up.
4. Light exercises done before playing a sport or exercising with greater effort are called a warm-up. When a performer plays an instrument or sings just before a performance in order to be ready, this is a warm-up.
5. Warm-up clothes are worn during a warm-up. Warm-up exercises are done before playing a sport or exercising. A warm-up game, round, and so on, is played in order to warm up for the actual game.

1. To become more friendly or open
2. To do preliminary exercises so as to stretch the muscles
3. To run until the normal working temperature is reached
4. When the temperature of a thing or place becomes higher, it warms up.

1. When people or things cause a thing or place to become warmer, they warm it up.
2. When you allow a mechanical device to run for a short time before being used, you warm it up. When a mechanical device runs for a short time before being used, it warms up.