button up

Definition of button up

  1. transitive verb
  2. 1 :  to close tightly and securely a tank buttoned up and ready for action

  3. 2 :  to carry to completion button up an order or assignment

  4. 3 :  to bring to complete and final decision or irrevocable settlement

  5. intransitive verb
  6. :  to become mum

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