老牛筋

lǎoniújīn ㄌㄠˇ ㄋㄧㄡˊ ㄐㄧㄣ

    • stubborn, rigid person who will not change course

Character by character

Saying俗语俗語

Idiom惯用语 · Widely known

Literally
old ox sinew
Meaning
A stubborn, rigid person who will not adapt or change course. Critical or mocking.

Sources