Take a long word, cut it short, and you get a quick everyday one: combination becomes combo. What the short word points at is always the same — separate things standing side by side and counted as one. A tray with rice and soup on it. A few players in a corner. A run of hits the game counts as one chain. Two cards that only matter together.
把一個長字剪短，就得到一個輕快的日常字——combination 變成 combo。它指的東西一直沒變：幾樣分開的東西並在一起，被當成一份來算。一個托盤上有飯有湯。角落裡三五個樂手。遊戲裡接連不斷的一串攻擊。兩張分開很普通、湊在一起才有意義的牌。
From the word’s history
Wiktionary records combo as a clipping of combination plus -o, which is why the word still means a set of things taken together and why it sounds casual.
Wiktionary 記 combo 是 combination 切短再加 -o 造出來的。這解釋了兩件事：它的意思一直是「湊在一起的一組」，而且它聽起來比原字隨性得多。
Wiktionary, "combo"
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