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Verb: belt up
  1. Refuse to talk or stop talking; fall silent
    "The children belt up when their father approached"
    - close up, clam up, dummy up [N. Amer], shut up, button up, be quiet, keep mum

Derived forms: belts up, belting up, belted up

Nearest

Belsen
Belshazzar
belt
belt along
belt ammunition
belt bag
belt buckle
belt down
belt maker
belt out
belt up
Beltane
belted
belted ammunition
belted kingfisher
belted sandfish
belt-fed
belting
beltless
beltlike
belt-like