ETYM French acrobate, from Greek, walking on tiptoe, climbing aloft; acro high + bainein.
An athlete who performs acts requiring skill and agility and coordination.
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1. A glass with a flat bottom but no handle or stem; originally had a round bottom.
2. A gymnast who performs rolls and somersaults and twists etc.
3. A movable obstruction in a lock that must be adjusted to given position (as by a key) before the bolt can be thrown.
roller · tumbler pigeon