beware
UK[bɪˈweə]US[bɪˈwer]
v
To be cautious and alert to danger or trouble.
Etymology
The word "beware" originates from a Middle English imperative construction "be war," a direct command meaning "be cautious." Its core, the Old English adjective "wær" (cautious, prudent), stems from the Proto-Germanic waraz, which is itself derived from the Proto-Indo-European root wer- meaning "to perceive, watch out for." This etymological journey shows how a simple, ancient root for perception evolved into a specific warning. The fusion of the verb "be" with the adjective "war" created a single, standalone verb that has retained its imperative force and sense of urgent caution into modern English.
Analysis
The word is a fused imperative form derived from the Middle English phrase "be war," where "be" is the imperative of the verb "to be" and "war" is an adjective from Old English "wær" meaning "cautious, aware."
Examples
Beware of the dog.
Travelers were told to beware of pickpockets in the crowded market.
You should beware of making hasty promises.