潜せん入にゅう者しゃ

noun

intruder; infiltrator

Refers to a person who secretly enters a place, organization, or system, often with a specific purpose such as spying, sabotage, or unauthorized access.

• 警けい備び員いんは建たて物ものに潜せん入にゅう者しゃを見みつけた。

  The security guard found an intruder in the building.

• 彼かれは敵てき組そ織しきに潜せん入にゅう者しゃとして送おくり込こまれた。

  He was sent into the enemy organization as an infiltrator.