Where does “misoshiru” come from?

misoshiru (English) comes from Japanese 味噌汁, from Japanese 味噌, from Proto-Japonic *misau.

misoshiru (English): miso soup

Definitions

Step	Language	Word	Meaning
1	Japanese	味噌汁	miso soup: a soup, based in thick bean paste (called miso) and dashi, with some vegetables, tofu, occasionally meat
2	Japanese	味噌	miso; the innards of a crab or shrimp resembling...
3	Proto-Japonic	*misau	—