Where does “trānsversāre” come from?

trānsversāre (Latin) comes from Latin transversus, from Proto-Italic *trānsworssos.

Ancestry of “trānsversāre”, step by step

Step	Language	Word	Meaning
1	Latin	transversus	turned across, lying across, from side to side;...
2	Proto-Italic	*trānsworssos	—

trānsversāre — Etymology, Origin & Word History | Etymology Explorer