Where does “tosar” come from?

tosar (Old Portuguese) comes from Vulgar Latin tonsare, from Latin tondeō, from Proto-Indo-European tend-, from Proto-Indo-European temh₂- — to stretch, string; to cut.

Ancestry of “tosar”, step by step

tosar traces back through two separate lines of ancestry.

via Vulgar Latin tonsare

StepLanguageWordMeaning
1Vulgar Latintonsare—
2Latintondeōto shave, shear, clip
3Proto-Indo-Europeantend-to stretch, to extend; to split, cut off
4Proto-Indo-Europeantemh₂-to stretch, string; to cut

via Proto-Germanic þurisaz

StepLanguageWordMeaning
1Proto-Germanicþurisazgiant; demon; monster; name of the þ-rune
2Proto-Indo-Europeantur-—
Every word from Proto-Indo-European temh₂- →Every word from Proto-Indo-European tend- →Every word from Latin tondeō →