off rocker


Also called runner. one of the curved pieces on which a cradle or a rocking chair, rocks.
a rock-'n'-roll song: She sang a ballad and followed that with two of her well-known rockers.
any of various devices that operate with a rocking motion.
Graphic Arts. a small steel plate with one curved and toothed edge for roughening a copperplate to make a mezzotint.
Mining. cradle ( def 13 ).
an ice skate that has a curved blade.
a performer or fan of rock music.
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 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rocker (ˈrɒkə)
1.  See also rocker arm any of various devices that transmit or operate with a rocking motion
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
6.  a.  an ice skate with a curved blade
 b.  the curve itself
7.  skating
 a.  a figure consisting of three interconnecting circles
 b.  a half turn in which the skater turns through 180°, so facing about while continuing to move in the same direction
8.  a rock-music performer, fan, or song
9.  (Brit) Compare mod an adherent of a youth movement rooted in the 1950s, characterized by motorcycle trappings
10.  slang off one's rocker crazy; demented

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"a rocking chair," 1852, Amer.Eng., from rock (v.); earlier "nurse charged with rocking a cradle" (c.1400). 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) is recorded from 1963.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

Rock (rŏk), John. 1890-1984.

American gynecologist and obstetrician who helped develop (1954) the first effective oral contraceptive.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
rock   (rŏk)  Pronunciation Key 
  1. A relatively hard, naturally occurring mineral material. Rock can consist of a single mineral or of several minerals that are either tightly compacted or held together by a cementlike mineral matrix. The three main types of rock are igneous, sedimentary, and metamorphic.

  2. A piece of such material; a stone.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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