戴松緊帽

Simplified: 戴松紧帽

dàisōngjǐnmào ㄉㄞˋ ㄙㄨㄥ ㄐㄧㄣˇ ㄇㄠˋ

    • to make vague, general criticism that hits no one in particular

Character by character

Saying俗语俗語

Idiom惯用语 · Rarely used now

Literally
wear an elastic-band hat
Meaning
To make criticism that is vague and general, so it fits anyone and hits no one in particular.

Sources