getting stories straight; arranging a consistent story
Refers to the act of coordinating what people will say in advance so that their accounts match. Often used in contexts of collusion or covering up. The verb form is 口裏を合わせる.
See also: 口裏を合わせる
They got their stories straight and gave the same excuse.
Their story coordination was exposed, and the lie came to light.
Compound of 口裏 (くちうら, 'what one says; one's story') and 合わせ (あわせ, 'matching; coordination').