tán qín
to play or strum a lute or other stringed instrument
duì niú tán qín
lit. to play the lute to a cow (idiom)
fig. offering a treat to an unappreciative audience
to cast pearls before swine
caviar to the general
to preach to deaf ears
to talk over sb's head
luàn tán qín
to talk nonsense
to behave like a fool