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rocker (n.)

1852, "a rocking chair," American English, agent noun from rock (v.1). Middle English had rokker, "nurse charged with rocking a cradle" (early 14c.). In sense of "one of the curved pieces of wood that makes a chair or cradle rock" it dates from 1787. Meaning "one who enjoys rock music" (opposed to mod (n.1)) is recorded from 1963, from rock (v.2).

Slang off (one's) rocker "crazy" is attested by 1897 according to OED; a widely reprinted 1903 newspaper column in U.S. identified it as British slang; the image is perhaps mechanical. To get (off) one's rocker seems to have been used earlier in U.S. baseball slang for "get busy, get active in a game" (1895) and does suggest the rocking-chair.

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Definitions of rocker from WordNet

rocker (n.)
an attendant who rocks a child in a cradle;
rocker (n.)
a performer or composer or fan of rock music;
Synonyms: rock 'n' roll musician
rocker (n.)
a teenager or young adult in the 1960s who wore leather jackets and rode motorcycles;
rocker (n.)
a chair mounted on rockers;
Synonyms: rocking chair
rocker (n.)
a trough that can be rocked back and forth; used by gold miners to shake auriferous earth in water in order to separate the gold;
Synonyms: cradle
rocker (n.)
an ice skate with a curved blade;
rocker (n.)
a curved support that permits the supported object to rock to and fro;
From wordnet.princeton.edu