1. (n.) A piece, 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. (n.) A small piece of ordnance, turning on a point or swivel; -- called also swivel gun.

3. (v. i.) To swing or turn, as on a pin or pivot.

arbor axis axle axle bar axle shaft axle spindle axle-tree circle circulate circumrotate circumvolute come about crank distaff fetch about fulcrum gimbal go about go around go round gudgeon gyrate gyre heel hinge hingle hub mandrel nave oarlock pin pintle pirouette pivot pivot about pole put about radiant revolve rotate round rowlock screw spin spindle swing swing round trunnion turn turn a pirouette turn about turn around turn round turn tail twist veer veer around wamble wheel wheel about whirl wind