Rock2  —v. 1 move gently to and fro; set, maintain, or be in, such motion. 2 (cause to) sway; shake, oscillate, reel. 3 distress, perturb (rocked by the news). —n. 1 rocking movement. 2 spell of this. 3 a = *rock and roll. B rock and roll-influenced popular music.  rock the boat colloq. Disturb a stable situation. [old english]