Where does “cheü” come from?

cheü (Old French) comes from Vulgar Latin *cadūtus, from Latin cadēre, from Latin cadō, from Proto-Italic kadō, from Proto-Indo-European ḱad- — to fall.

Ancestry of “cheü”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	*cadūtus	—
2	Latin	cadēre	—
3	Latin	cadō	—
4	Proto-Italic	kadō	fall, sink
5	Proto-Indo-European	ḱad-	to fall

Every word from Proto-Indo-European ḱad- →