skyhook

1. (astronautics) A proposed momentum-exchange tether for launching payloads into low Earth orbit by hooking them to the end of a cable that reaches down from an orbiting station into the upper atmosphere.Examples: "It was during those battles that ORBITAL-class armor was deployed to secure and defend the skyhooks and tethers above Earth, Luna, and Mars."

2. (slang) A CB radio antenna.Examples: "[…] despite the absence of the proverbial home-grown 75-foot high steel "sky hook.""slang

3. (tennis) A form of the overhead smash in which the eastern grip is used to hit the ball farther behind the body than usually possible.

4. (climbing) A small hook for gripping small and slippery protrusions.Synonyms: bathook

5. (board sports) A device covering the rider's boot and sometimes screwed to the board, to facilitate jumping and enhance stability.Examples: "Tom bought the rights to a plastic board that had a skateboard deck and skyhooks."