塌陷 Traditional form: 塌陷 Pinyin (reading): tāxiàn Definitions: to subside to sink to cave in Characters: 塌 - to collapse, to fall into ruin 陷 - to sink, to plunge; trap, pitfall Traditional characters: 塌 - to collapse, to fall into ruin 陷 - to sink, to plunge; trap, pitfall