behave

 
Pronunciation: /bɪˈheɪv/

verb

[no object]
  • 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
  • (of a machine or natural phenomenon) work or function in a specified way: each car behaves differently
  • 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

Origin:

late Middle English: from be- 'thoroughly' + have in the sense 'have or bear (oneself) in a particular way'