露馅子

Traditional (Taiwan): 露餡子

lòuxiànzi ㄌㄡˋ ㄒㄧㄢˋ ˙ㄗ

    • for a concealed secret to come out
    • to be exposed

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
the filling shows
Meaning
A concealed secret finally comes out, like filling spilling from a dumpling.

Sources