水米没沾牙

Traditional (Taiwan): 水米沒沾牙

shuǐmǐméizhānyá ㄕㄨㄟˇ ㄇㄧˇ ㄇㄟˊ ㄓㄢ ㄧㄚˊ

    • not having eaten or drunk a thing

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
water and rice haven't touched the teeth
Meaning
Not having eaten or drunk a thing, often because of grief, illness or being busy.

Sources