密みっ計けい

noun

secret plan; secret scheme

Refers to a plan or scheme kept hidden from others, often with a connotation of intrigue or conspiracy.

• 彼かれらは密みっ計けいを巡めぐらせて、ライバル会社がいしゃを追おい詰つめようとした。

  They hatched a secret plan to corner their rival company.