Picture the box at the front of the shop, the one everybody picks up and puts down again. Nothing inside has ever been used. But the corner is scuffed, the top has dust on it, and the price has quietly come down. The word is built out of exactly that scene — shop plus soiled — and it points at where the wear came from rather than at how bad it is. Move the same box over to ideas and you get a line that has been picked up by too many people: still fine, but nobody looks twice at it any more.
From the word’s history
The source gives the make-up directly: from shop (noun) plus soiled (adjective). The compound writes the scene into the word — the marks came from the shop.
來源資料直接給了組成：shop（名詞）加 soiled（形容詞）。這個複合字把場景寫進字裡——那些痕跡是在店裡沾上的。
Wiktionary, "shop-soiled"
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