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English word behave comes from Middle English (1100-1500) bihabben
bihabben (Middle English)
behave (English)
(intransitive) To act in a polite or proper way.. (intransitive) To act, conduct oneself in a specific manner; used with an adverbial of manner.. (obsolete, transitive) To conduct, manage, regulate (something).. (reflexive) To conduct (oneself) well, or in a given way.