moo-tué摸底

to know the real situation

to know the real situation; to try to find out the real intention or situation; to sound somebody out

English Wiktionary, “摸底” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E6%91%B8%E5%BA%95 · confidence: Medium (Wiktionary, Hokkien)