Where does “croup” come from?

croup (Scots) comes from Middle English roupen, from Old English hrōpan, from Proto-West Germanic hrōpan, from Proto-Germanic hrōpaną, from Proto-Indo-European ḱer-, from Proto-Indo-European kr̥-, from Proto-Indo-European ker- — army.

Ancestry of “croup”, step by step

StepLanguageWordMeaning
1Middle Englishroupen
2Old Englishhrōpanto shout, proclaim; cry out, scream, howl; to cry...
3Proto-West Germanichrōpanto cry out, to call, to shout
4Proto-Germanichrōpanąto cry out, call, shout
5Proto-Indo-Europeanḱer-to grow, to make grow, to nourish; to plait,...
6Proto-Indo-Europeankr̥-to turn, to bend
7Proto-Indo-Europeanker-army

Words derived from “croup

Every word from Proto-Indo-European ker-Every word from Proto-Indo-European kr̥-Every word from Proto-Indo-European ḱer-