Where does “sim” come from?

sim (Macanese) comes from Portuguese sim, from Old Portuguese si, from Latin sibi, from Proto-Indo-European sébʰye, from Proto-Indo-European swé — self.

sim (Macanese): yes

Definitions

Ancestry of “sim”, step by step

Step	Language	Word	Meaning
1	Portuguese	sim	yes; indeed; do; yes; yea
2	Old Portuguese	si	yes, affirmatively
3	Latin	sibi	the dative of the reflexive pronoun meaning to...
4	Proto-Indo-European	sébʰye	—
5	Proto-Indo-European	swé	self

Every word from Proto-Indo-European swé →Every word from Proto-Indo-European sébʰye →Every word from Latin sibi →