Definition of avast exclamation from the Oxford Advanced Learner's Dictionary

 

avast

 exclamation
exclamation
BrE BrE//əˈvɑːst//
 
; NAmE NAmE//əˈvæst//
 
 
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used to tell sailors to stop carrying out a particular action Word Origin early 17th cent.: from Dutch hou'vast, houd vast ‘hold fast!’.
See the Oxford Advanced American Dictionary entry: avast