A deaf ear.
One that refuses to listen; as if it heard not.
Bow down Thine ear.
Condescend to hear or listen. (Ps. xxxi. 2.) By ear.
To sing or play by ear means to sing or play without knowledge of musical notes, depending on the ear only.
Give ear to
... Listen to; give attention to. I am all ear.
I was all ear, And took in strains that might create a soul Under the ribs of death.
Milton: Comus, 574.
I'll send you off with a flea in your ear.
With a cuff or box of the ear. The allusion is to domestic animals, who are sometimes greatly annoyed with these “tiny torments.” There seems also to be a pun implied —flea
The French equivalent is “Mettre la puce à l'oreille, '” to give one a good jobation.
In at one ear, and out at the other.
Forgotten as soon as heard.
A bad ear for musical intonations; “ear-blind” or “sound-blind.” Dionysius's Ear.
A bell-shaped chamber connected by an underground passage with the king's palace. Its object was that the tyrant of Syracuse might over-hear whatever was passing in the prison.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894