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.
Phrases and idioms:
off one's rocker sl. crazy.