Wiktionary
n. (context idiomatic English) The mental faculty or inner sense with which one produces or reproduces imagined or recalled sounds solely within the mind; the supposed organ within the mind which experiences such sounds.
Usage examples of "mind's ear".
Music could be faintly heard in his mind's ear, and strange tongues.
In my mind's ear I seemed to hear Lady Sally say contemptuously, You don't want me-I'll give you a chit to see the chaplain.
With Center whispering in his mind's ear, he was unlikely to fall victim to that illusion himself.
After several more exchanges, he began to see the patterns, the relationships between what he heard in his mind's ear, and what was actually happening.
In her mind's ear she could hear him when he was home on his island and relaxed and maybe a little drunk, telling friends and cousins how he was hit on once by this gaunt crow of a woman, old enough to be—.
Moreover, it was formulating its thoughts in actual English words, which entered my mind's ear, so to speak.