Where does “inunda” come from?

inunda (Latin) comes from Latin inundo, from Latin in-, from Latin in, from Old Latin en, from Proto-Italic en, from Proto-Indo-European h₁én — in.

inunda (Latin): second-person singular present active imperative...

Definitions

Step	Language	Word	Meaning
1	Latin	inundo	I overflow, inundate, flood
2	Latin	in-	un-, non-, not; in, within, inside
3	Latin	in	in, at, on, upon, from; within, while in; into,...
4	Old Latin	en	in
5	Proto-Italic	en	in
6	Proto-Indo-European	h₁én	in