verb, -haved, -hav⋅ing.| 1. | to act in a particular way; conduct or comport oneself or itself: The ship behaves well. |
| 2. | to act properly: Did the child behave? |
| 3. | to act or react under given circumstances: This plastic behaves strangely under extreme heat or cold. |
| 4. | to conduct or comport (oneself) in a proper manner: Sit quietly and behave yourself. |