keep one's head on a swivel
To be on the alert, to be watchful.
You all kept your head on a swivel and that's what you gotta do when you find yourself in a vicious cock fight.
noun
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.
The patter of feet, and clatter of strap and swivel, seemed to swell into a bewildering din, but they were almost upon the fielato offices, where the carretera entered the town, before a rifle flashed.
A small piece of ordnance, turning on a point or swivel; called also swivel gun.
[The settlement] was entirely surrounded by a broad unfordable marsh or swamp, which prevented all communication, except by private paths under water, known only to the rebels, and before which Baron had placed loaded swivels […]
Applied to guns mounted upon the cartridges were fired without being tripods, stands, swivels, or carriages
Strength of mind or character that enables one to overcome adversity; confidence; force of will.
Bob ain't got no swivel.
The act of swivelling.
A rotating of the hips.
verb
To swing or turn, as on a pin or pivot.
As expected, Swansea began the game with some patient passing and the first chance fell to striker Michu in the fourth minute when he controlled a cross by Jonjo Shelvey and swivelled in the penalty box, only to fire over the bar.