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.
From the word’s history
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.')
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