avast


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a·vast

 (ə-văst′)
interj. Nautical
Used as a command to stop or desist.

[From Middle Dutch hou vast, hold fast : hou, houd, imperative of houden, to hold + vast, fast; see past- in Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

avast

(əˈvɑːst)
sentence substitute
(Nautical Terms) nautical stop! cease!
[C17: perhaps from Dutch hou'vast hold fast]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

a•vast

(əˈvæst, əˈvɑst)
imperative verb. Naut.
(used as a command to stop or cease).
[1675–85; perhaps < Dutch houdvast hold fast]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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References in classic literature ?
But avast, he added, tapping his forehead, you haint no objections to sharing a harpooneer's blanket, have ye?
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Avast, me hearties Pirates Support Club members Marie Cadenhead, Myra Roy and Lilian Mitchell