rock·er /ˈrɑkɚ/
 搖的人,搖桿


 Rock·er, n.
 1. One who rocks; specifically, one who rocks a cradle.
    It was I, sir, said the rocker, who had the honor, some thirty years since, to attend on your highness in your infancy.   --Fuller.
 2. One of the curving pieces of wood or metal on which a cradle, chair, etc., rocks.
 3. Any implement or machine working with a rocking motion, as a trough mounted on rockers for separating gold dust from gravel, etc., by agitation in water.
 4. A play horse on rockers; a rocking-horse.
 5. A chair mounted on rockers; a rocking-chair.
 6. A skate with a curved blade, somewhat resembling in shape the rocker of a cradle.
 7. Mach. Same as Rock shaft.
 Rocker arm Mach., an arm borne by a rock shaft.

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 rocker
      n 1: an attendant who rocks a child in a cradle
      2: a performer or composer or fan of rock music [syn: {rock 'n'
         roll musician]
      3: a teenager or young adult in the 1960s who wore leather
         jackets and rode motorcycles
      4: a chair mounted on rockers [syn: rocking chair]
      5: a trough on rockers used by gold miners to shake earth in
         water in order to separate the gold [syn: cradle]
      6: an ice skate with a curved blade
      7: a curved support that permits the supported object to rock
         to and fro