noun, noun or participle which takes 'suru', intransitive verb
collusion; concerted action; acting in concert
Formal or literary term for two or more parties secretly cooperating or coordinating their actions, often with a negative connotation of scheming together.
両社が策応して価格を操作していたことが明らかになった。
It came to light that the two companies had been colluding to manipulate prices.
敵軍と策応する内通者がいた。
There was a traitor who was acting in concert with the enemy forces.