Also called runner. one of the curved pieces on which a cradle or a rocking chair rocks.

rocking chair.

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.

noun

chair , cradle , musician , singer