追本溯源 zhuī běn sù yuán

DEFINITIONS

  1. to trace sth back to its origin

CHARACTERS

追 zhuī
HSK 5
pursue, chase after; expel
本 běn
HSK 1
root, origin, source; basis
溯 sù go upstream, go against current; formerly
源 yuán
HSK 5
spring; source, head; surname