沉陷

沉陷	chén xiàn	to sink; to cave in; (of a building etc) to subside / (fig.) to get lost (in contemplation, daydreams etc)
沉	chén	to submerge / to immerse / to sink / to keep down / to lower / to drop / deep / profound / heavy
陷	xiàn	pitfall / trap / to get stuck / to sink / to cave in / to frame (false charge) / to capture (a city in battle) / to fall (to the enemy) / defect