flywheel (noun) balance wheel: regulating wheel
Sinonime: bastille, black hole, brig, bullpen,
can*, cell, clink, cooler, detention camp, dungeon, house of correction,
inside*, jailhouse,
joint*, lockup,
pen, penal institution, penitentiary,
pound,
prison, rack, reformatory, slammer,
solitary*,
stir*, stockade, up the river