beware

The definition of beware is to be cautious of and alert to potential dangers or risks.

(verb)

If you need to be cautious of hitting a deer when driving on a dark road, this is an example of when you need tobeware of deer.

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See beware in Webster's New World College Dictionary

intransitive verb, transitive verb bewared, bewaring

to be wary or careful (of); be on one's guard (against)

Origin: assoc. with be, imper. + ware, but prob. < OE bewarian, to keep watch < be- + warian, to watch, be wary

See beware in American Heritage Dictionary 4

verb be·wared, be·war·ing, be·wares
verb, transitive
To be on guard against; be cautious of: “Beware the ides of March” (Shakespeare).
verb, intransitive
To be cautious; exert caution: We had to beware of the icy patches on the road. Beware of the dog.

Origin:

Origin: Middle English ben war

Origin: : ben, to be; see be 

Origin: + war, on one's guard; see ware2

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