Where does “یاش” come from?

یاش (Ottoman Turkish) comes from Proto-Turkic yāĺ, from Turkish -mek, from Ottoman Turkish ـمك.

یاش (Ottoman Turkish): moist; wet; humid

Definitions

Step	Language	Word	Meaning
1	Proto-Turkic	yāĺ	age; year; young, fresh, green, raw, moist;...
2	Turkish	-mek	Infinitive ending of verbs having a front or high...
3	Ottoman Turkish	ـمك	—

یاش — Etymology, Origin & Word History | Etymology Explorer