/bɪˈweə(r) ||; bɪˈwɛr/verb [I] (only in the imperative or infinitive 只用于祈使语气或不定式) beware (of sb/sth) (used for giving a warning) to be careful （用于发出警告）当心，提防，注意: Beware of the dog! (= written on a sign) 提防恶犬！（写在告示牌上）We were told to beware of strong currents in the sea. 有人告诉我们要当心海里的激流。