Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary


verb imperative \ə-ˈvast\

Definition of avast

  1. —a nautical command to stop or cease

Origin and Etymology of avast

perhaps from Dutch houd vast hold fast

First Known Use: 1681

Other Nautical Terms

Seen and Heard

What made you want to look up avast? Please tell us where you read or heard it (including the quote, if possible).