瓜菜代

guācàidài ㄍㄨㄚ ㄘㄞˋ ㄉㄞˋ

    • to substitute inferior goods
    • to lower one's standards

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
melon and vegetables instead
Meaning
Originally a famine measure of adding melons and vegetables to the staple grain; figuratively, lowering standards or substituting inferior goods.

Sources