noun, noun or participle which takes 'suru', transitive verb
vigilance; caution; alertness; precaution; being on guard
Refers to a state of watchfulness against danger, trouble, or mistakes. Used for both physical security and abstract wariness. Common in compounds like 警戒心 (sense of caution) and 警戒態勢 (alert posture).
警察は不審者に警戒を強めた。
The police heightened their vigilance against suspicious individuals.
台風の接近に警戒してください。
Please be on alert for the approaching typhoon.
彼は警戒心が強く、すぐには人を信用しない。
He is very cautious and doesn't trust people easily.