地ち下か活かつ動どう

noun

underground activity; underground movement

Refers to secret, often political or resistance activities conducted outside official channels. Can be used for historical resistance movements or modern clandestine operations.

• 戦せん時じ中ちゅう、彼かれは地ち下か活かつ動どうに参さん加かしていた。

  During the war, he was involved in underground activities.

• その組そ織しきは地ち下か活かつ動どうを通つうじて情じょう報ほうを集あつめている。

  The organization gathers information through underground activities.