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Verb: belt up
  1. [Brit, informal] Refuse to talk or stop talking; fall silent
    "The suspect belted up when questioned by the police";
    - close up, clam up [informal], dummy up [N. Amer, informal], shut up, button up, be quiet, keep mum [informal]
     
  2. Fasten one's seatbelt
    "Remember to belt up before driving"
Interjection: belt up
Usage: Brit, informal
  1. Be quiet, stop talking
    - put a sock in it [informal], shut up

Derived forms: belts up, belting up, belted up

Type of: forbear, refrain

Antonym: open up