1880, "boll-worm, corn parasite" (corn-ear-worm attested from 1855), from ear (n.2) + worm (n.). Also an old alternative name for "earwig" (from ear (n.1)); from 1881 as "secret counselor." From 1989 as "annoyingly unforgettable pop song or part of a song."
1. Her ear, shoulder and hip are in a straight line.
2. Simon finished dialing and clamped the phone to his ear.
3. She sat on Rossi's knee as he whispered in her ear.
4. Build her up with kindness and a sympathetic ear.
5. Hearing can be affected by ear wax blocking the ear canal.