One way to hold this word: a door with nobody standing at it. There is no list, no queue and no referee, so whoever arrives simply walks in and takes what they can reach. Everything else the word does comes from that missing gatekeeper — sometimes the result is a messy situation, sometimes it is a crowd all arguing at once, sometimes it is a match where nobody is on your side.
Two branches
沒有人管的場面
門口沒有人擋，於是整個狀況失去規矩。這一家的重點在「規則不見了」，而不是在「有人打起來」。
noun · B2
A situation where there are no rules and nobody is in charge, so everyone does what they want and anything can happen. People say this when they think the situation has become messy or unfair.
亂局；毫無規矩的場面
所有人同時上場
一樣是沒有人擋，只是走進門的是一大群人，而且他們彼此對上。這一家的重點在「人數」和「沒有分邊」。
noun · B2
A noisy quarrel or fight that many people join in at the same time, with no clear sides and no rules.
混戰；亂成一團的爭吵