Something disagreeable to the ear; a very unpleasant noise.
Late 16th century; earliest use found in Richard Carew (1555–1620), antiquary and poet. From ear + sore, probably after eyesore.
Having sore or deafened ears. Formerly also: deafening, cacophonous.
Mid 19th century; earliest use found in Allen's Indian Mail. From ear + sore.