Base-jump meaning

bās
A parachute jump from high structures and precipitous earth formations, typically from heights of 305 meters (1,000 feet) or less.
noun
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A parachute jump from a fixed point rather than from an aircraft; typically from a tall building, high bridge or rock formation.
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(intransitive) To make such a jump.
verb
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Origin of base-jump

  • b(uilding) a(ntenna tower) s(pan) e(arth) jump

    From American Heritage Dictionary of the English Language, 5th Edition

  • Building, Antenna-tower, Span, Earth

    From Wiktionary