Etymology
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skyhook (n.)

also sky-hook, "imaginary device to hold things up," 1915, originally aviators' jargon, from sky (n.) + hook (n.). Applied from 1935 to actual device for lifting things into the air.

updated on October 06, 2013

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Definitions of skyhook from WordNet

skyhook (n.)
helicopter carrying a reel of steel cable that can be used to lift and transport heavy objects;
skyhook (n.)
a hook that is imagined to be suspended from the sky;
From wordnet.princeton.edu, not affiliated with etymonline.