Where does “досѣдѣти” come from?

досѣдѣти (Old Church Slavonic) comes from Old Church Slavonic сѣдѣти, from Proto-Slavic sěděti, from Proto-Balto-Slavic *sēdḗˀtei, from Proto-Indo-European sḗd- — to sit.

досѣдѣти (Old Church Slavonic): bring about by sitting, achieve through sitting (waiting)

Definitions

bring about by sitting, achieve through sitting (waiting)

Ancestry of “досѣдѣти”, step by step

досѣдѣти traces back through two separate lines of ancestry.

via Old Church Slavonic сѣдѣти

Step	Language	Word	Meaning
1	Old Church Slavonic	сѣдѣти	to sit, be sitting; reside
2	Proto-Slavic	sěděti	to sit, to be sitting
3	Proto-Balto-Slavic	*sēdḗˀtei	to sit
4	Proto-Indo-European	sḗd-	to sit

via Old Church Slavonic до

Step	Language	Word	Meaning
1	Old Church Slavonic	до	up to; until
2	Proto-Slavic	dȍ	up to, until
3	Proto-Indo-European	de	Emphatic or contrastive particle, and, but;...

Every word from Proto-Indo-European sḗd- →Every word from Proto-Balto-Slavic *sēdḗˀtei →Every word from Proto-Slavic sěděti →