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... kind of circus performer?

• Drinking glass

• Glass

• Glass of a sort

• Pigeon that executes backward somersaults in flight or on the ground

• 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