rockrockrocksrockedrocking2verb (rocks, rocking, rocked)to move slowly backwards and forwards or from side to side; to make somebody or something do this: The boat was rocking gently on the lake.I rocked the baby until she went to sleep.rockrockrocks1noun1(no plural) the very hard material that is in the ground and in mountains2(pluralrocks) a big piece of rock: The ship hit the rocks.3(no plural) (alsorock music) a sort of modern music with a strong rhythm: a rock concert