追根究底

to get to the heart of the matter

to sculpt / to carve / musical instrument (old)

to chase / to pursue / to look into / to investigate / to reminisce / to recall / to court (one's beloved) / to binge-watch (a TV drama) / retroactively / posthumously

to trace sth back to its source / to get to the bottom of sth

root / basis / classifier for long slender objects, e.g. cigarettes, guitar strings / CL:條|条[tiao2] / radical (chemistry)

to investigate (sth) thoroughly / to get to the bottom of

after all / to investigate / to study carefully / Taiwan pr. [jiu4]

(equivalent to 的 as possessive particle)

background / bottom / base / end (of the month, year etc) / remnants / (math.) radix / base

erhua variant of 追根究底[zhui1 gen1 jiu1 di3]