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rocker

rocker /ˈrɑːkɚ/ noun
plural rockers
rocker
/ˈrɑːkɚ/
noun
plural rockers
Britannica Dictionary definition of ROCKER
[count]
: 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
chiefly US : rocking chair
: someone who plays or performs rock music
: someone who enjoys listening to rock music

off your rocker

informal
: crazy