摸底細

Simplified: 摸底细

mōdǐxì ㄇㄛ ㄉㄧˇ ㄒㄧˋ

    • to find out the real facts about a matter or person
    • to probe the background

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
feel out the underlying details
Meaning
Find out the real facts or background of a matter or person.

Sources