隔年衣裳隔夜饭

Traditional (Taiwan): 隔年衣裳隔夜飯

géniányīshanggéyèfàn ㄍㄜˊ ㄋㄧㄢˊ ㄧ ˙ㄕㄤ ㄍㄜˊ ㄧㄝˋ ㄈㄢˋ

    • stale, outdated matters
    • old things not worth bringing up

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
last year's clothes and yesterday's meal
Meaning
Refers to things that are past, stale or out of date. It is used dismissively of old matters that are no longer worth bringing up.

Sources