rocker

UK: /ˈrɒkə^r/ US: /ˈrɑkɚ/ ,(rok′ər)

WordReference Random House Learner's Dictionary of American English © 2026

rock•er /ˈrɑkɚ/   n. [countable]

1. Furniture Also called runner. one of the curved pieces on which a rocking chair rocks.
2. Furniture rocking chair:
   sitting in his rocker by the fire.
3. any of various devices that operate with a rocking motion.
4. Music and Dance a performer or fan of rock music.

Idioms

5. Idioms off one's rocker, [Slang.] insane;
   crazy:
   You must be off your rocker to say such a thing.

WordReference Random House Unabridged Dictionary of American English © 2026

rock•er  (rok′ər), n. 

1. Furniture Also called runner. one of the curved pieces on which a cradle or a rocking chair rocks.
2. Furniture See rocking chair. 
3. Music and Dance a rock-'n'-roll song:
   She sang a ballad and followed that with two of her well-known rockers.
4. any of various devices that operate with a rocking motion.
5. Fine Art [Graphic Arts.] a small steel plate with one curved and toothed edge for roughening a copperplate to make a mezzotint.
6. Mining cradle (def. 13).
7. an ice skate that has a curved blade.
8. Music, Music and Dance a performer or fan of rock music.
9. off one's rocker, [Slang.] insane;
   crazy:
   You're off your rocker if you think I'm going to climb that mountain.

• 1400–50; late Middle English: one who rocks a cradle; see rock², -er¹

Collins Concise English Dictionary © HarperCollins Publishers::

rocker / ˈrɒkə/ noun

1. any of various devices that transmit or operate with a rocking motion
   See also rocker arm
2. another word for rocking chair
3. either of two curved supports on the legs of a chair or other article of furniture on which it may rock
4. another word for cradle9
5. an ice skate with a curved blade
6. the curve itself
7. a rock-music performer, fan, or song
8. an adherent of a youth movement rooted in the 1950s, characterized by motorcycle trappings
   Compare mod1
9. off one's rocker ⇒ crazy