Where does “accoster” come from?

accoster (Old French) comes from Vulgar Latin accosto, from Latin ad, from Proto-Italic ad, from Proto-Indo-European h₂éd — to, at.

Ancestry of “accoster”, step by step

Step	Language	Word	Meaning
1	Vulgar Latin	accosto	to come alongside someone
2	Latin	ad	toward, to; up to; near, by, close by, at, to
3	Proto-Italic	ad	toward, to, on, up to, for
4	Proto-Indo-European	h₂éd	to, at

accoster — Etymology, Origin & Word History | Etymology Explorer