Definition of rock verb from the Oxford Advanced Learner's Dictionary. [intransitive, transitive] to move gently backwards and forwards or from side to side; to make somebody/something move in this way. (+ adv./prep.) The boat rocked from side to side in the waves. She was rocking backwards and forwards in her seat. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.