寻根溯源 xúngēnsùyuán to trace to the source Origin Definitions Defs Strokes Stroke Words Sentences Sents 寻根 尋根 xúngēn to get to the bottom of things to investigate the source or root cause of a matter溯源 sùyuán to trace back to the source To trace a river upstream to its headwaters; also used to mean investigating the origin or root cause of something.