beware

[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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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
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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 alcohol or other factors that may encourage confessional impulses.
Beware of boasts by makers of the latest exercise machines.
Beware of the latest line in less lethal weapons: a scooter equipped with an
  air gun.
Hikers must beware of sudden thunderstorms that can catch them on exposed
  ridges at any time of year.
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