Definition of buttoned-up in English:

buttoned-up

Syllabification: but·toned-up

Entry from US English dictionary

adjective

  • 1Reserved and not inclined to reveal information: Fleischer’s buttoned-up style
  • 2Secured to the maximum degree against attack: the tank had been buttoned up and had not been seriously damaged

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Word of the day astrogation
Pronunciation: ˌastrə(ʊ)ˈgeɪʃ(ə)n
noun
(in science fiction) navigation in outer space