Note: Rock differs from shake, as denoting a slower, less violent, and more uniform motion, or larger movements. It differs from swing, which expresses a vibratory motion of something suspended.
ROCK
Rock, v. i.
1. To move or be moved backward and forward; to be violently agitated; to reel; to totter. The rocking town Supplants their footsteps. J. Philips .
2. To roll or saway backward and forward upon a support; as, to rock in a rocking-chair.
ROCKAWAY
Rock"a*way, Etym: [Probably from Rockaway beach, where it was used.]
Defn: Formerly, a light, low, four-wheeled carriage, with standing top, open at the sides, but having waterproof curtains which could be let down when occasion required; now, a somewhat similar, but heavier, carriage, inclosed, except in front, and having a door at each side.
ROCKELAY; ROCKLAY
Rock"e*lay, Rock"lay, n.
Defn: See Rokelay. [Scot.]
ROCKER
Rock"er, 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.