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rocker

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

1400–50; late Middle English: one who rocks a cradle; see rock2, -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for off one's rocker

rocker

noun
  1. any of various devices that transmit or operate with a rocking motionSee 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. a steel tool with a curved toothed cage, used to roughen the copper plate in engraving a mezzotint
  5. mining another word for cradle (def. 9)
    1. an ice skate with a curved blade
    2. the curve itself
  6. skating
    1. a figure consisting of three interconnecting circles
    2. a half turn in which the skater turns through 180°, so facing about while continuing to move in the same direction
  7. a rock-music performer, fan, or song
  8. British an adherent of a youth movement rooted in the 1950s, characterized by motorcycle trappingsCompare mod 1
  9. off one's rocker slang crazy; demented
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for off one's rocker

rocker

n.

"a rocking chair," 1852, American English, from rock (v.1); earlier "nurse charged with rocking a cradle" (early 14c.). In sense of "one of the curved pieces of wood that makes a chair or cradle rock" it dates from 1787. Slang off (one's) rocker "crazy" first recorded 1897. Meaning "one who enjoys rock music" (as opposed to mod (n.1)) is recorded from 1963, from rock (v.2).

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Online Etymology Dictionary, © 2010 Douglas Harper

Idioms and Phrases with off one's rocker

off one's rocker

Also, off one's nut or trolley. See off one's head.

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rocker

see off one's head (rocker).

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.