verb (used with object)
to be wary, cautious, or careful of (usually used imperatively): Beware such inconsistency. Beware his waspish wit.
verb (used without object)
to be cautious or careful: Beware of the dog.

1150–1200; Middle English, from phrase of warning be ware. See be, ware2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
beware (bɪˈwɛə)
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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

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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