Where does “cynio” come from?

cynio (Welsh) comes from Welsh cyn, from Middle Welsh kyn, from Proto-Brythonic *kün, from Latin cuneus, from Proto-Indo-European h₂ḱū, from Proto-Indo-European h₂eḱ- — sharp.

cynio (Welsh): to chisel

Definitions

to chisel

Ancestry of “cynio”, step by step

Step	Language	Word	Meaning
1	Welsh	cyn	before
2	Middle Welsh	kyn	as, so followed by the
3	Proto-Brythonic	*kün	—
4	Latin	cuneus	wedge, wedge shape; troops arrayed in a wedge...
5	Proto-Indo-European	h₂ḱū	sting
6	Proto-Indo-European	h₂eḱ-	sharp

Every word from Proto-Indo-European h₂eḱ- →Every word from Proto-Indo-European h₂ḱū →Every word from Latin cuneus →