警戒(けいかい)

けいかい
noun, verb-suru
vigilance, caution, alert
1. vigilance, caution, being on guard
A state of careful watchfulness against potential danger, threats, or problems. Used for both personal wariness and official security measures.
警察(けいさつ)が厳重(げんじゅう)に警戒(けいかい)している。
The police are on high alert.
台風(たいふう)に警戒(けいかい)してください。
Please be on guard against the typhoon.
野良猫(のらねこ)は人間(にんげん)を警戒(けいかい)して近(ちか)づかない。
Stray cats are wary of humans and don't come close.

USAGE:
警戒(けいかい) can be used as a noun or する verb. When used with を, it marks the thing being guarded (台風(たいふう)を警戒(けいかい)する). It appears frequently in news reports about natural disasters, crime, and security. Animals being wary of humans is also a common usage.

COMMON COLLOCATIONS:

  • 警戒(けいかい)する: to be on guard, to watch out for
  • 厳重(げんじゅう)に警戒(けいかい)する: to be on high/strict alert
  • 警戒(けいかい)を強(つよ)める: to heighten vigilance
  • 警戒(けいかい)レベル: alert level
  • 警戒(けいかい)区域(くいき): restricted/warning area
  • 警戒(けいかい)態勢(たいせい): alert posture/state of readiness
  • 警戒(けいかい)を怠(おこた)る: to let one's guard down

SIMILAR WORDS:
注意(ちゅうい) (caution, attention) is a milder, everyday word. 警戒(けいかい) implies a more serious, active state of readiness against a specific threat. 用心(ようじん) (precaution) focuses on taking preventive measures.

general
Added 2026.2.28 12:08
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