Where does “sustot” come from?

sustot (Occitan) comes from Occitan tot, from Old Occitan tot, from Vulgar Latin tōttus, from Latin tōtus, from Latin tot, from Proto-Indo-European toti, from Proto-Indo-European só — this; that.

sustot (Occitan): above all, especially

Definitions

above all, especially

Ancestry of “sustot”, step by step

Step	Language	Word	Meaning
1	Occitan	tot	all; each, every; everything
2	Old Occitan	tot	all
3	Vulgar Latin	tōttus	—
4	Latin	tōtus	whole, all, entire, total, complete, every part
5	Latin	tot	so many
6	Proto-Indo-European	toti	so many
7	Proto-Indo-European	só	this; that

Every word from Proto-Indo-European só →Every word from Proto-Indo-European toti →Every word from Latin tot →