Definition of avast in English:

avast

exclamation

Nautical
  • Stop; cease.

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

Origin

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

Pronunciation

avast

/əˈvɑːst/