[juhmp-mas-ter, -mah-ster]
a person who supervises the jumping of paratroopers or other parachutists.

1940–45; jump + master

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Regardless of what the diver does, the jumpmaster can deploy the parachute at the right moment.
While the jumpmaster pulls you in or cuts you lose, we're losing drop zone.
Participating paratroopers are supervised by a foreign jumpmaster from one of ten countries.
Determine who is the jumpmaster or loadmaster for the flight.
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