noun
Refers to a person who secretly collects information, often for a government or organization. Similar to スパイ but with a slightly more formal or literary tone.
See also: スパイ
彼は戦時中、密偵として活動していた。
He worked as a spy during the war.
noun, noun or participle which takes 'suru', transitive verb
spying; espionage
The act of spying; can be used as a noun or with する to mean 'to spy on' or 'to conduct espionage'.
敵国の動きを密偵する任務を与えられた。
He was given the mission of spying on the enemy country's movements.