To conduct (oneself) well, or in a given way.
You need to behave yourself, young lady.
To act, conduct oneself in a specific manner; used with an adverbial of manner.
He behaves like a child whenever she's around.
To conduct, manage, regulate (something).
To act in a polite or proper way.
His mother threatened to spank him if he didn't behave.
(in combination) Exhibiting the specified kind of behaviour.
a rudely-behaved child