Where does “Hirnfrost” come from?

Hirnfrost (German) comes from German frost, from Middle High German vrost, from Old High German frost, from Proto-West Germanic *frost, from Proto-Germanic frustaz, from Proto-Indo-European prustós — frost.

Hirnfrost (German): brain freeze

Definitions

  1. brain freeze

Ancestry of “Hirnfrost”, step by step

Hirnfrost traces back through two separate lines of ancestry.

via German frost

StepLanguageWordMeaning
1Germanfrostfrost; freezing weather weather conditions below 0 °C
2Middle High Germanvrost—
3Old High Germanfrostfrost
4Proto-West Germanic*frost—
5Proto-Germanicfrustazcold; frost; freezing weather; frost; rime
6Proto-Indo-Europeanprustósfrost

via German Hirn

StepLanguageWordMeaning
1GermanHirnbrain
2Middle High Germanhirne—
3Old High Germanhirnibrain
4Proto-West Germanic*hirʀnībrain
Every word from Proto-Indo-European prustós →Every word from Proto-Germanic frustaz →Every word from Proto-West Germanic *frost →