Where does “clausio” come from?

clausio (Vulgar Latin) comes from Latin clausus, from Latin claudere, from Latin claudo, from Proto-Italic klaudō — close.

Ancestry of “clausio”, step by step

Step	Language	Word	Meaning
1	Latin	clausus	closed, inaccessible; having been closed;...
2	Latin	claudere	present active infinitive of claudō;...
3	Latin	claudo	I shut, close, lock; I imprison, confine; I...
4	Proto-Italic	klaudō	close

clausio — Etymology, Origin & Word History | Etymology Explorer