Definition of beware verb from the Oxford Advanced American Dictionary

 

beware

 verb
verb
NAmE//bɪˈwɛr//
 
[intransitive, transitive]
 
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(used only in infinitives and in orders) if you tell someone to beware, you are warning them that someone or something is dangerous and that they should be careful beware of somebody/something Drivers have been warned to beware of icy roads. beware (of) doing something Beware of saying anything that might reveal where you live. beware somebody/something It's a great place for swimming, but beware dangerous currents.
See the Oxford Advanced Learner's Dictionary entry: beware