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definitions
  • synonyms

belt up

verb (adverb)
  1. slang to become or cause to become silent; stop talking: often used in the imperative
  2. to fasten with or by a belt, esp a seat belt
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012