A cunning plan or trick, often with a negative connotation of deceit. Somewhat literary or formal; in everyday speech 策略 or 計略 are more common.
Be careful not to fall for the enemy's ruse.
His proposal was nothing more than a trick.
Composed of 詭 (deceive, cheat) and 謀 (plot, scheme). The exact historical derivation is uncertain, but the kanji combination directly conveys the meaning of a deceptive plan.