Definition of rocker
1a
: either of two curving pieces of wood or metal on which an object (such as a cradle) rocks
c
: any of various objects in the form of a rocker or with parts resembling a rocker (such as a skate with a curved blade)
d(1)
: any of the curved stripes at the lower part of a chevron worn by a noncommissioned officer above the rank of sergeant
(2)
: the curved stripe at the upper part of a chevron worn by a chief petty officer
2
: any of various devices that work with a rocking motion
3
: a rock performer, song, or enthusiast
off one's rocker
: in a state marked by extreme confusion or mental unsoundness
… he felt dizzy, slightly off his rocker at this extraordinary assailment of his senses.— Bernard Malamud
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Merriam-Webster unabridged
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Time Traveler for rocker
The first known use of rocker was in 1760
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