Webster's English Dictionary

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rock

1. rock \'ra:k\ vb [ME rokken, fr. OE roccian; akin to OHG rucken to cause 
   to mo]ve 1a: to move back and forth in or as if in a cradle  1b: to wash 
   (placer gravel) in a cradle  2a: to cause to sway back and forth  2b1: 
   DAZE, STUN  2b2: DISTURB, UPSET  1: to become moved backward and forward 
   under impact  2: to move oneself or itself rhythmically back and forth  SYN 
   syn SHAKE 
2. rock n : a rocking movement 
3. rock n [ME roc, fr. MD rocke; akin to OHG rocko distaff, roc c]oat : 
   DISTAFF 
4. rock n [ME rokke, fr. ONF roque, fr. (assumed) VL rocca] often attrib  
   1: a large mass of stone forming a cliff, promontory, or peak  2: a 
   concreted mass of stony material; also : broken pieces of such  masses 3: 
   consolidated or unconsolidated solid mineral matter; also : a pa rticular 
   mass of it 4a: something like a rock in firmness :  4a1: FOUNDATION, 
   SUPPORT  4a2: REFUGE  4b: something that threatens or causes disaster - 
   often used in pl.  5: a stick candy with color running through  slang  6: 
   DIAMOND  1: in or into a state of destruction or wreckage  2: on ice cubes 
   {bourbon on the rocks}  - on the rocks