Definition of avast in English:

avast

exclamation

Nautical
  • Stop; cease:

    ‘a sailor is expected to keep hauling until the mate hollers ‘Avast!’’
    • ‘Avast there ye scalliwags!’
    • ‘Time to splice yer mainbrace, stow yer bilge, avast yer scurvy dog.’

Origin

Early 17th century: from Dutch hou'vast, houd vast hold fast!.

Pronunciation

avast

/əˈvɑːst/