Beware (verb)

1. To be cautious or vigilant, especially in avoiding danger or harm.
2. To take care, especially in view of potential danger or difficulty.

Origin:

Middle english: from old norse vara (infinitive), várr (imperative), 'be careful, take care', of germanic origin; related to wary.

Examples:

1. Beware of the slippery floor.
2. She warned us to beware of the dog before entering the yard.
3. Beware of falling rocks on the hiking trail.
4. The sign read 'Beware of the cliff's edge'.
5. Beware of making hasty decisions without careful consideration.