Where does “for” come from?

for (Galician) comes from Galician ser, from Old Portuguese seer, from Latin sedere, from Latin sedo, from Latin sedeō, from Proto-Italic sedēō, from Proto-Indo-European sḗd- — to sit.

for (Galician): first/third-person singular future subjunctive of...

Definitions

first/third-person singular future subjunctive of...

Ancestry of “for”, step by step

Step	Language	Word	Meaning
1	Galician	ser	to be; first-person singular personal infinitive...
2	Old Portuguese	seer	to be
3	Latin	sedere	second-person singular present passive...
4	Latin	sedo	I allay, settle, still, calm, assuage or appease;...
5	Latin	sedeō	to sit, to be seated
6	Proto-Italic	sedēō	sit, be sitting, be seated
7	Proto-Indo-European	sḗd-	to sit

Every word from Proto-Indo-European sḗd- →Every word from Proto-Italic sedēō →Every word from Latin sedeō →