Where does “ymddiswyddo” come from?

ymddiswyddo (Welsh) comes from Welsh diswyddo, from Welsh swydd, from Middle Welsh swyð, from Proto-Brythonic *suɨð, from Latin sēdēs, from Latin sedeō, from Proto-Italic sedēō, from Proto-Indo-European sḗd- — to sit.

ymddiswyddo (Welsh): to resign, to quit

Definitions

to resign, to quit

Ancestry of “ymddiswyddo”, step by step

Step	Language	Word	Meaning
1	Welsh	diswyddo	dismiss, remove from office, discharge
2	Welsh	swydd	job; office, post, position, capacity; county
3	Middle Welsh	swyð	—
4	Proto-Brythonic	*suɨð	—
5	Latin	sēdēs	seat, chair
6	Latin	sedeō	to sit, to be seated
7	Proto-Italic	sedēō	sit, be sitting, be seated
8	Proto-Indo-European	sḗd-	to sit

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