Rocker

n.	1.	One who rocks; specifically, one who rocks a cradle. It was I, sir, said the rocker, who had the honor, some thirty years since, to attend on your highness in your infancy. - Fuller.
	2.	One of the curving pieces of wood or metal on which a cradle, chair, etc., rocks.
	3.	Any implement or machine working with a rocking motion, as a trough mounted on rockers for separating gold dust from gravel, etc., by agitation in water.
	4.	A play horse on rockers; a rocking-horse.
	5.	A chair mounted on rockers; a rocking-chair.
	6.	A skate with a curved blade, somewhat resembling in shape the rocker of a cradle.
	7.	(Mach.) Same as Rock shaft. Rocker arm (Mach.) an arm borne by a rock shaft. To be off one's rocker to be insane.

Noun	1.	rocker - an attendant who rocks a child in a cradle
	2.	rocker - a performer or composer or fan of rock music Synonyms: rock 'n' roll musician
	3.	rocker - a teenager or young adult in the 1960s who wore leather jackets and rode motorcycles
	4.	rocker - a chair mounted on rockers Synonyms: rocking chair
	5.	rocker - a trough on rockers used by gold miners to shake earth in water in order to separate the gold Synonyms: cradle
	6.	rocker - an ice skate with a curved blade
	7.	rocker - a curved support that permits the supported object to rock to and fro

burin, clarifier, colander, cradle, cribble, die, engraving tool, etching ball, etching ground, etching needle, etching point, filter, graver, intaglio, lixiviator, metronome, needle, oscillator, pendulum, percolator, point, punch, purifier, refiner, refinery, riddle, rocking chair, rocking stone, scorper, screen, seal, seesaw, shuttle, shuttlecock, sieve, sifter, stamp, strainer, style, swing, teeter, teeter-totter, teeterboard, teetery-bender, vibrator, winnow, winnowing basket, winnowing fan, winnowing machine