Melee
Free For All
noun
A riot of war is where things go nuts. This is a melee! A free for all!
らんせん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
あの試合はまれに見る乱戦だった。
That game was a free for all that we don't see very often.
コウイチのスピーチのせいでかん客の間に乱戦が起こってしまった。
A melee occurred in the audience due to Koichi's speech.
セール初日、モールは人でごった返しになり、まるで大乱戦のようだった。
On the first day of the sale, the mall became super crowded, like it was some kind of battle royal.