Where does “sled head” come from?

sled head (English) comes from English head, from English -y, from Middle English -y, from Old English -iġ, from Proto-West Germanic -g, from Proto-Germanic -gaz, from Proto-Indo-European -ḱos — -y, -ic.

sled head (English): A concussion or subconcussive injury caused by tobogganing, including luging, skeleton, bobsledding, tubing; that stereotypically leaves the victim woozy or muddle-headed

Definitions

  1. A concussion or subconcussive injury caused by tobogganing, including luging, skeleton, bobsledding, tubing; that stereotypically leaves the victim woozy or muddle-headed

Ancestry of “sled head”, step by step

sled head traces back through two separate lines of ancestry.

via English head

StepLanguageWordMeaning
1EnglishheadThe part of the body of an animal or human which...
2English-yAdded to nouns and adjectives to form adjectives...
3Middle English-yDesignates an adjective, in many cases formed by...
4Old English-iġ-y, -ic
5Proto-West Germanic-gForms adjectives from nouns and verbs with a...
6Proto-Germanic-gaz-y
7Proto-Indo-European-ḱos-y, -ic

via English sled

StepLanguageWordMeaning
1EnglishsledA small, light vehicle with runners, used...
2Middle Englishsledde
3Middle Dutchsledde
4Proto-Germanicslidôsled, sleigh
Every word from Proto-Indo-European -ḱosEvery word from English -yEvery word from Old English -iġ