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beware

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

1150–1200; Middle English, from phrase of warning be ware. See be, ware2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for beware

heed, shun, avoid, mind, notice, attend

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British Dictionary definitions for beware

beware

verb
  1. (usually used in the imperative or infinitive, often foll by of) to be cautious or wary (of); be on one's guard (against)
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Word Origin for beware

C13 be war, from be (imperative) + war wary
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for beware

v.

c.1200, probably from a conflation of be ware (though the compound bewarian "defend" existed in Old English). See wary.

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Online Etymology Dictionary, © 2010 Douglas Harper