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The Collaborative International Dictionary of English v.0.48 (gcide)

Rock \Rock\, v. t. [imp. & p. p. {Rocked};p. pr. & vb. n.
{Rocking}.] [AS. roccian; akin to Dan. rokke to move, to
snake; cf. Icel. rukkja to pull, move, G. r["u]cken to move,
push, pull.]
1. To cause to sway backward and forward, as a body resting
on a support beneath; as, to rock a cradle or chair; to
cause to vibrate; to cause to reel or totter.
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A rising earthquake rocked the ground. --Dryden.
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2. To move as in a cradle; hence, to put to sleep by rocking;
to still; to quiet. "Sleep rock thy brain." --Shak.
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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.
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Rocking \Rock"ing\, a.
Having a swaying, rolling, or back-and-forth movement; used
for rocking.
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{Rocking shaft}. (Mach.) See {Rock shaft}.
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