pivot

(noun) the person in a rank around whom the others wheel and maneuver. Synonyms: pivot man.

(noun) axis consisting of a short shaft that supports something that turns. Synonyms: pin.

(noun) the act of turning on (or as if on) a pivot. Example: "The golfer went to the driving range to practice his pivot."

(verb) turn on a pivot. Synonyms: swivel.