a gymnast who performs rolls and somersaults and twists etc.
a glass with a flat bottom but no handle or stem; originally had a round bottom
a movable obstruction in a lock that must be adjusted to a given position (as by a key) before the bolt can be thrown
pigeon that executes backward somersaults in flight or on the ground
One who tumbles; one who plays tricks by various motions of the body; an acrobat.