Where does “Kampfrichterin” come from?

Kampfrichterin (German) comes from German Kampfrichter, from German kampf, from Middle High German kampf, from Old High German kampf, from Proto-West Germanic kamp, from Latin campus, from Proto-Indo-European kh₂emp-, from Proto-Indo-European kh₂em- — to bend, to curve.

Ancestry of “Kampfrichterin”, step by step

StepLanguageWordMeaning
1GermanKampfrichterreferee
2Germankampfstruggle, battle, campaign, fight
3Middle High Germankampf
4Old High Germankampf
5Proto-West Germanickampfield; battle
6LatincampusOpen flat level ground: a plain, a natural field;...
7Proto-Indo-Europeankh₂emp-to bend; crooked; to bend, curve
8Proto-Indo-Europeankh₂em-to bend, to curve
Every word from Proto-Indo-European kh₂em-