ascertain, bring to light, cast about, chase, determine, dig out, dig up, disclose, discover, disinter, elicit, excavate, exhume, expose, extract, fish out, fish up, follow, grub up, hunt, hunt out, learn, nose out, penetrate, pierce, probe, pry out, pursue, quest, reveal, root out, root up, scout out, search for, search out, seek, spy out, trail, turn up, uncover, unearth, worm out