追本溯源

zhuī běn sù yuán

Meaning

to trace sth back to its origin

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Characters

追zhuīto pursue, to chase after; to expel辶丿㠯本běnroot, origin, source; basis木一溯sùto paddle upstream, to go against the current; to trace the source; formerly氵朔源yuánspring; source, root, head; surname氵原