Definition of avast in English:

avast

exclamation

Nautical
  • Stop; cease.

    ‘you, young man, avast there!’
    • ‘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

/əˈvast//əˈvæst/