ROCKER

n. 1 a person or thing that rocks. 2 a curved bar or similar support, on which something can rock. 3 a rocking-chair. 4 Brit. a young devotee of rock music, characteristically associated with leather clothing and motor cycles. 5 a skate with a highly curved blade. 6 a switch constructed on a pivot mechanism operating between the 'on' and 'off' positions. 7 any rocking device forming part of a mechanism. off one's rocker sl. crazy.