a barbed hook, usually metal, used for fishing
a jack (the playing card)
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.
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.
A small piece of ordnance, turning on a point or swivel; called also swivel gun.
Strength of mind or character that enables one to overcome adversity; confidence; force of will.
The act of swivelling.
A rotating of the hips.
To swing or turn, as on a pin or pivot.