rock·er 
/ˈrɑ:kɚ/ noun
plural rock·ers /ˈrɑ:kɚ/ noun [count] 1 : a curved piece of wood or metal on which an object (such as a cradle or chair) moves back and forth or from side to side 2 chiefly US : rocking chair 3 a : someone who plays or performs rock music
b : someone who enjoys listening to rock music
b : someone who enjoys listening to rock music
off your rocker
