Picture a box with sorted things inside, and then somebody picks it up and shakes it hard. Everything jumps out of its place and lands against something it does not match: a key on a sock, a photo under a spoon. Put the box down and look in, and there is no order left to follow. That shaken box is jumble — as the mess itself, as the shaking, and as the table of old things somebody sells on a Saturday.
Jumble comes from Middle English jumbelen, a form built on jumpen, to jump. The shaking picture is not a later metaphor: the jumping is in the word from the start.
jumble 來自中古英文 jumbelen，是從 jumpen（跳）那條線變出來的。也就是說，「東西跳離原位」不是後來才加上的比喻，這個跳的畫面本來就在字裡面。
Wiktionary entry for jumble (packet evidence: 'From Middle English jumbelen, alteration of jumbren, jombren, a variant of jumpren, frequentative of jumpen (to jump), equal to jump + -le.')
Two branches
混成一團，和把東西弄成那樣
這個家族就是被搖過的盒子本身：一邊是搖完之後的樣子，一邊是搖這個動作。
noun · B2
A lot of different things mixed together with no order and no tidiness, so that nothing is where it should be — and, in the same way, a mix of thoughts, feelings, sounds or words that will not sort themselves out.
一堆混亂；亂七八糟的一團
義賣攤上的一堆舊東西
義賣桌上的東西正好就是那個被搖過的盒子：沒有人配過，什麼都有一點。所以「一團亂」的字直接變成了那批貨的名字，接著又變成那場活動的名字。這兩個意思主要在英國使用。
noun · C1
In British English, the used clothes, books and other odds and ends that people give away to be sold cheaply at a jumble sale, usually to raise money for a school or a charity.
義賣的二手雜物