Where does “修羅場” come from?

修羅場 (Japanese) comes from Japanese 場, from Old Japanese 庭 — garden; ground; place where something is done;...

修羅場 (Japanese): location of the fight between the (king of) Asuras and 帝釈天}}

Definitions

Step	Language	Word	Meaning
1	Japanese	場	a place; a field; a flattened area used for...
2	Old Japanese	庭	garden; ground; place where something is done;...