過了篩子過籮

Simplified: 过了筛子过箩

guòleshāiziguòluó ㄍㄨㄛˋ ˙ㄌㄜ ㄕㄞ ˙ㄗ ㄍㄨㄛˋ ㄌㄨㄛˊ

    • to screen in layers
    • to check repeatedly and thoroughly

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
through the sieve, then through the fine sieve
Meaning
Screening in layers; checking something repeatedly and thoroughly.

Sources