Where does “آچمق” come from?

آچمق (Ottoman Turkish) comes from Old Anatolian Turkish آچْمَقْ, from Proto-Turkic ač- — to open.

Ancestry of “آچمق”, step by step

Step	Language	Word	Meaning
1	Old Anatolian Turkish	آچْمَقْ	—
2	Proto-Turkic	ač-	to open

آچمق — Etymology, Origin & Word History | Etymology Explorer