追溯

lit. to go upstream / to trace sth back to / to date from

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 go upstream / to trace the source

variant of 溯[su4]