趁虚而入 chènxū'érrù seize opportunity Origin Definitions Defs Strokes Stroke Words Sentences Sents 1 sentence 敌军趁虚而入，很快就略取了边境的三座城镇。 díjūn chènxū'érrù, hěn kuài jiù lüè qǔ le biānjìng de sān zuò chéngzhèn. The enemy took advantage of the weakness and quickly seized three border towns. Source: Dong Chinese Dictionary