be·ware

[bih-wair]
verb (used with object)
1.
to be wary, cautious, or careful of (usually used imperatively): Beware such inconsistency. Beware his waspish wit.
verb (used without object)
2.
to be cautious or careful: Beware of the dog.

Origin:
1150–1200; Middle English, from phrase of warning be ware. See be, ware2

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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
beware (bɪˈwɛə) [Click for IPA pronunciation guide]
 
vb (often foll by of)
to be cautious or wary (of); be on one's guard (against)
 
[C13 be war, from be (imperative) + warwary]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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00:10
Beware is one of our favorite verbs.
So is subtilize. Does it mean:
to bark; yelp.
to introduce subtleties into or argue subtly about.
Etymonline
Word Origin & History

beware
c.1200, probably from a conflation of be ware (though the compound bewarian "defend" existed in O.E.). See wary.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But travelers might beware that they get what they are asking for.
And stick to the woods, keep clear of the road and beware of your headlamp.
Even vegetarians should beware the consequences of governmental ownership of water.
Beware those who would confuse the latter with the former.
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