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The children behaved very badly.
a badly behaved dog
You behaved like a complete idiot!
This is not how you behave towards a child.
He behaved as though he hadn't seen Ellie.
She was embarrassed at having behaved in such a childish way.
Mum's always telling me to behave when we go out.
I hope the children behave themselves.
This is the British English definition of behave. View American English definition of behave.