Language: Ainu
Source: John Batchelor; An Ainu-English-Japanese dictionary. 1905.
Description
Mekkashike is the Ainu word for the back of a knife, or sword. Also the ridge of a mountain or house.1
I wonder whether it is meant to describe all backs of knives and swords, or specifically the ridged spine seen on some larger blades.

Ridged spine on an Ainu dagger.
Sold by Mandarin Mansion in 2022.
Notes
1. John Batchelor; An Ainu-English-Japanese dictionary (including a grammar of the Ainu language). Tokyo Methodist Publishing House, 1905.
Glossary of terms

# |
English |
Ainu |
|
1 | Knife blade | makiri-ibe / ibehe | |
2 | Knife handle | makiri-nip | |
3 | Knife sheath | makiri-saya | |
4 | Back of knife | mekkashike | |
5 | Edge | notak | |
6 | Point of knife | kanetuhu / etuhu | |
Further reading
Main glossary article: Makiri
Glossary article: Kuttom-ushbe
Glossary article: Emushi
Article: Knives and swords of the Ainu