n. an imaginary crane; an imaginary tool. : I can't get this thing outa here without a sky hook.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
skyhook
"imaginary device to hold things up," 1915, originally aviators' jargon, from sky + hook. Applied from 1935 to actual device for lifting things into the air.