Longman Dictionary of Contemporary English homepage

Date: 1200-1300
Origin: be + ware 'careful' (11-19 centuries) (from Old English wær)

beware

 verb
     
be‧ware [intransitive,transitive only in imperative and infinitive]
used to warn someone to be careful because something is dangerous
beware of
Beware of the dog!
beware of doing something
They should beware of making hasty decisions.
Police warned drivers to beware.
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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