GNU Collaborative International Dictionary of English

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1.       
   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. rücken 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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   ☞ 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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