/ bɪˈweə(r); NAmE -ˈwer/ verb
beware (of sb/sth / of doing sth) (used only in infinitives and in orders) if you tell sb to beware , you are warning them that sb/sth is dangerous and that they should be careful :
[ v ]
Motorists have been warned to beware of icy roads.
Beware of saying anything that might reveal where you live.
[ vn ]
It's a great place for swimming, but beware dangerous currents.
[also v -ing ]
••
WORD ORIGIN
Middle English : from the phrase be ware (from be- and archaic ware aware ).