Synonyms of 'misbehave'
If a child is acting up, they are behaving badly.(informal)
I could hear him acting up downstairs.
muck about (British , slang)
get up to mischief (informal)
If you say that someone is carrying on, you are irritated with them because they are talking very excitedly and saying a lot of unnecessary things.(informal)
She was yelling and screaming and carrying on like an idiot.
toe the line
mind your manners
mind your p's and q's
conduct yourself properly
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act up (informal)
Thesaurus for misbehave from the Collins English Thesaurus
If someone, especially a child , misbehaves , they behave in a way that is not acceptable to other people.