里应外合

lǐyìngwàihé

里应外合 — lǐyìngwàihé

1. to coordinate inside and outside offensives (idiom); to act together

   在这次行动中，他们里应外合，迅速击溃了敌人。 zài zhècì xíngdòng zhōng tāmen lǐyìngwàihé xùnsù jīkuì le dírén — In this operation, they coordinated inside and outside offensives and quickly defeated the enemy.