Picture a container filled right to the rim, and then a little more poured in. What runs over the edge is what this word is looking at. It never describes the amount that fits; it describes the part that could not be held in — a laugh that is too loud for the room, leaves that have crossed the path, that went on past the point where the door was enough.
From the word’s history
The word comes from Latin exūberō, to be abundant, built from ex (out) and uber (udder). The original picture was milk so plentiful that it dripped from the udder by itself — overflow, before anyone had squeezed anything.
它來自拉丁文 exūberō（多得不得了），由 ex（出來）加 uber（乳房）組成。最初的畫面是乳汁多到自己滴出來——還沒有人去擠，它就已經溢出來了。
Wiktionary etymology supplied in this evidence packet (kaikki:3f6f69a190036ae4): from Latin exūberāns, participle of exūberō (be abundant), from ex (out) + uber (udder).
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