拾鞋底

shíxiédǐ ㄕˊ ㄒㄧㄝˊ ㄉㄧˇ

    • to follow old, obsolete practices or ideas

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
picking up worn-out shoe soles
Meaning
Means following old, obsolete or discarded practices or ideas. Mildly critical.

Sources