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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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 skedaddle. Does it mean:
to run away hurriedly; flee.
to bark; yelp.
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
Beware of rainstorms upstream, since they may cause flash flooding.
Consumers should beware of purchasing reconditioned or used mattresses and furniture accordingly.
Beware funding for projects that slip too easily into contemporary policy debates.
There will always be those that aren't, but then as with everything: let the buyer beware.
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