expression, ichidan verb
devise a plan; work out a plan
A somewhat literary set phrase meaning to come up with a clever scheme or stratagem. Often used when someone thinks of a way to solve a problem or achieve a goal.
See also: 一計
彼は難局を打開するため、一計を案じた。
He devised a plan to break the deadlock.
He worked out a plan and succeeded in deceiving the enemy.