American Heritage Dictionary
(1)
Century Dictionary
(1)
GNU Webster's 1913
(1)
WordNet
Elsewhere on the web
The answer turned out to be "avast," revealing the wickedness of the puzzle maker because the clue and the answer don't exactly match.
New version of avast! antivirus kernel features outstanding detection abilities, together with high performance.— Fulldls.com
Is there any way to use the KeyGen for the Windows Home Server version of avast?— Mininova
So, avast, ye lubbers, start talkin 'like a pirate.— Megite Technology News: What's Happening Right Now

American Heritage Dictionary (1)
Century Dictionary (1)
Bubble size: how much this word was used in a year
Bubble height: used more or less than expected, vs. all uses evenly distributed
You can expect to see this word a few times a year.
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