Where does “head-scratcher” come from?

head-scratcher (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.

head-scratcher (English): A scratcher for the head; A puzzle

Definitions

  1. A scratcher for the head; A puzzle

Ancestry of “head-scratcher”, step by step

head-scratcher 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 Scratcher

StepLanguageWordMeaning
1EnglishScratcherA user of the Scratch visual programming language
2English-erA person or thing that does an action indicated...
3Middle English-eragentive suffix; agent noun suffix
4Old French-erAlternative form of -ier, verbal suffix;...
5Latin-āriuser
6Proto-Italic*-āziosForms relational adjectives to nouns (and rarely numerals)
Every word from Proto-Indo-European -ḱosEvery word from English -yEvery word from Old English -iġ