厳げん戒かい

noun, noun or participle which takes 'suru', transitive verb, noun which may take the genitive case particle 'no'

strict security; heavy guard; tight vigilance

Used for heightened security measures, often by police or military, in response to a threat or event. Common in compounds like 厳戒態勢 (strict security posture).

• テロの脅きょう威いを受うけて、空くう港こうは厳げん戒かい態たい勢せいを敷しいた。

  In response to the terrorist threat, the airport was placed under strict security.

• 警けい察さつは周しゅう辺へんを厳げん戒かいしている。

  The police are keeping the area under heavy guard.