Seems like it was spelled that way looking at the etymology to differentiate kurb and curb. Seems like when horses were still prominent curb referred to a strap

Seems like it was spelled that way looking at the etymology to differentiate kurb and curb. Seems like when horses were still prominent curb referred to a strap used on horses. https://www.etymonline.com/word/kerb#etymonline_v_1818 https://www.etymonline.com/word/kerb#etymonline_v_1818 Basically, curb was a type of restraint meant to hold back. So a curb/kurb on the street is just a tiny retaining wall holding back dirt. Some times it is fun to look at etymology. Also makes phrases "like curb your ambition" make more sense.