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avast

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a⋅vast

  [uh-vast, uh-vahst]
Use avast in a Sentence
–verb (imperative) Nautical.
(used as a command to stop or cease): Avast heaving!
Origin:
1675–85; perh. < D houd vast hold fast (see hold 1 , fast 1 )
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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avast! Antivirus
Get protected against virus attack with US support, with avast!
www.avastusa.com/buyavast
Buy avast Online Now
100M Users trust avast - Buy & Download at Official Store Now!
www.avast.com
a·vast   (ə-vāst')   
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.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

avast 
1681, a nautical interjection, "hold! stop!" probably worn down from Du. houd vast "hold fast."
Online Etymology Dictionary, © 2001 Douglas Harper
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