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1 [with adverbial] act or conduct oneself in a specified way, especially towards others: he always behaved like a gentleman it is not acceptable for a student to behave like that towards a teacher
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(of a machine or natural phenomenon) work or function in a specified way: each car behaves differently
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2 [often in imperative] (also behave oneself) conduct oneself in accordance with the accepted norms of a society or group: ‘Just behave, Tom,’ he said they were expected to behave themselves