Where does “excusen” come from?

excusen (Middle English) comes from Old French escuser, from Latin excūsō, from Latin causa, from Old Latin caussa, from Proto-Indo-European kawd-teh₂.

Ancestry of “excusen”, step by step

Step	Language	Word	Meaning
1	Old French	escuser	to excuse oneself; to make excuses
2	Latin	excūsō	—
3	Latin	causa	cause, reason; case, claim, contention; motive,...
4	Old Latin	caussa	cause, reason, purpose; case, claim; Archaic form...
5	Proto-Indo-European	kawd-teh₂	—

Words derived from “excusen”

excuse
excuser
excusal
excuseth
excusability
excuseless
excusest
unexcusability
'scuse
exkuzar
exkuzo
exkuzebla
skius

Every word from Proto-Indo-European kawd-teh₂ →

excusen — Etymology, Origin & Word History | Etymology Explorer