duì​niú​tán​qín

literal meaning

对牛弹琴 (對牛彈琴) duì​niú​tán​qín
literal meaning verb
To play the lute to a cow; the literal origin of the idiom.
pearls before swine expression
To waste effort or words on an audience that is unable to understand or appreciate them; to preach to deaf ears or talk over someone's head.

Frequency

Written text
0.303 per million

Sources

Definitions
CC-CEDICT
Frequency data
BCC Corpus (BLCU)