a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

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

Dictionary.com Unabridged

verb (used without object)

to move or sway to and fro or from side to side.

to be moved or swayed powerfully with excitement, emotion, etc.

Mining. (of sand or gravel) to be washed in a cradle.

to dance to or play rock music.

(of popular music) to have the driving beat characteristic of rock.

EXPAND

Slang. to be very good, impressive, exciting, or effective: This show really rocks.

COLLAPSE

verb (used with object)

to move or sway to and fro or from side to side, especially gently and soothingly.

to lull in security, hope, etc.

to affect deeply; stun; move or sway powerfully, as with emotion: Everyone in the courtroom was rocked by the verdict.

10.

to shake or disturb violently: A thunderous explosion rocked the waterfront.

11.

Slang.

to stir up; animate: We're gonna rock this joint tonight!

to use, wear, or display (a look, garment, etc.) in a showy, self-confident manner and to great effect: Only you could rock that hat!

EXPAND

12.

Graphic Arts. to roughen the surface of (a copperplate) with a rocker preparatory to scraping a mezzotint.

13.

Mining. cradle (def. 22).

COLLAPSE

noun

14.

a rocking movement: the gentle rock of the boat.

15.

rock-'n'-roll (def. 1).

adjective

16.

rock-'n'-roll (def. 3).

Idiom

17.

rock the boat, Informal. to disrupt the smooth functioning or routine of something: Don't rock the boat by demanding special treatment from management.

Origin:
before 1100; Middle English rocken, Old English roccian; cognate with Middle Dutch rocken; akin to German rücken; Old Norse rykkja to jerk

Related forms

rock·a·ble, adjective

rock·ing·ly, adverb

un·rocked, adjective

Synonyms
1. roll, shake. See swing¹.

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Link To rocker

Collins

World English Dictionary

rocker (ˈrɒkə)

—n
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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Etymonline

Word Origin & History

rock

"to dance to popular music with a strong beat," 1948 (first attested in song title "We're gonna rock"), from rock (v.1), in earlier blues slang sense of "to cause to move with musical rhythm" (1922); often used at first with sexual overtones (cf. 1922 song title "My Man Rocks

EXPAND

Me (with One Steady Roll)"). Sense developed early 1950s to "play or dance to rock and roll music." Noun sense of "musical rhythm characterized by a strong beat" is from 1946, in blues slang. Rocksteady, Jamaican pop music style (precursor of reggae), is attested from 1969.

rocker

"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.

COLLAPSE

American Heritage

Medical Dictionary

Rock (rŏk), John. 1890-1984.

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

American Heritage

Science Dictionary

rock (rŏk) Pronunciation Key

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.
A piece of such material; a stone.

Slang Dictionary

rock definition

n.
and rock candy. crack, a crystallized form of cocaine. (Drugs. See also rocks.) : Some call it rock candy, and some call it crack.
n.
a crystallized form of heroin used for smoking. (Drugs.) : Max is hooked on rock—the kind that you smoke. , Powder is everywhere, but you can hardly find rock anymore.
n.
a diamond or other gemstone. : Look at the size of that rock in her ring.
Go to rocks. :
n.
a baseball; a basketball. : Michael passed the rock to Scottie, who turned and dropped it in the basket.
in.
to be really great. : The concerts didn't rock, but we had a good time throwing chairs.

Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
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rocker definition

n.
a rocking chair. (Not slang.) : I love to spend a sunny afternoon in my rocker.
n.
a rock and roll singer, song, or fan. (See also off (one's) rocker.) : Let's listen to a good rocker.

Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw Hill.
Cite This Source

American Heritage

Idioms & Phrases

rocker

see off one's head (rocker).