Where does “taciutosi” come from?

taciutosi (Italian) comes from Italian taciuto, from Italian tacere, from Latin tacēre, from Proto-Italic takēō, from Proto-Indo-European tak- — to be silent.

Ancestry of “taciutosi”, step by step

Step	Language	Word	Meaning
1	Italian	taciuto	past participle of tacere
2	Italian	tacere	to be silent; to dummy up; to keep quiet
3	Latin	tacēre	—
4	Proto-Italic	takēō	be silent
5	Proto-Indo-European	tak-	to be silent

Every word from Proto-Indo-European tak- →Every word from Proto-Italic takēō →Every word from Latin tacēre →