swivel

Short definition from Wiktionary

Noun

1. 1
   A piece, such as a ring or hook, attached to another piece by a pin, in such a manner as to permit rotation about the pin as an axis.
2. 2
   A small piece of ordnance, turning on a point or swivel; called also swivel gun.
3. 3
   Strength of mind or character that enables one to overcome adversity; confidence; force of will.
4. 4
   The act of swivelling.
5. 5
   A rotating of the hips.
6. 6
   A small, usually ball- or barrel-shaped device used in angling to connect sections of fishing lines, consisting of two rings linked via a thrust bearing pivot joint.

Verb

1. 1
   To swing or turn, as on a pin or pivot.