balance-beam

balance beam

noun
1.
a narrow wooden rail about 16 feet (5 meters) long and 4 inches (10 cm) wide, set horizontally on upright posts about 4 feet (1.2 meters) from the floor, used for performing feats of balancing and demonstrating gymnastic ability.
2.
a competitive gymnastic event for women in which such an apparatus is used.

Origin:
1945–50

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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