shimmy

Concise Oxford English Dictionary © 2008 Oxford University Press:
shimmy/ˈʃɪmi/

▶noun (pl. shimmies)

• 1 a kind of ragtime dance in which the whole body shakes or sways.

• 2 shaking, especially abnormal vibration of the wheels of a motor vehicle.

▶verb (shimmies, shimmying, shimmied)

• 1 dance the shimmy.

• 2 shake or vibrate abnormally.

• 3 move swiftly and effortlessly.

– origin early 20th cent.: of unknown origin.