這個拼法底下其實是2個不同的字，意思沒有關係， 只是長得一樣。下面分開列出來。跳到 二（撲克牌的 2） · 到底（加重語氣）
deuce
nOne way to hold this word: a small flat thing with two marks on it, sitting in your hand or on the table. A card with two pips, a dice face with two spots. The whole word is just the number two, wearing a game's clothes. Once you can see that two, the tennis score follows: at 40-40 the game no longer ends with one point, it ends with two.
From the word’s history
The source traces deuce through Middle English dewes and Old French deus back to Latin duo, 'two'. So the number two is not a guess about this word; it is what the word was.
來源資料把 deuce 一路接回中古英語 dewes、古法文 deus，最後是拉丁文 duo（二）。所以「二」不是我們替它想的畫面，它本來就是二。
Wiktionary (kaikki snapshot 3f6f69a190036ae4), deuce noun etymology 1: 'From Middle English dewes (two), from Anglo-Norman, from Old French deus, from Latin duo.'
A second word, same spelling
deuce
nA second, unrelated picture lives under the same spelling. Think of a polite door held open for a rude word: the speaker wants to name the Devil, and says deuce instead. Slipped into a question, it does not change what is being asked, only how hot the asking is.
From the word’s history
The source does not settle this one. It offers Late Latin dusius ('phantom, specter'), Scottish Gaelic taibhs ('ghost'), or Old French deus ('God') as possibilities, and lists it as a separate etymology from the 'two' word.
來源對這一支沒有定論，只列了幾個可能：晚期拉丁文 dusius（鬼影）、蘇格蘭蓋爾語 taibhs（幽靈），或古法文 deus（神）。可以確定的只有一件事：來源把它列成和「二」不同的另一條詞源。
Wiktionary (kaikki snapshot 3f6f69a190036ae4), deuce noun etymology 2: 'Compare Late Latin dusius (phantom, specter); Scottish Gaelic taibhs, taibhse (apparition, ghost); or from Old French deus (God), from Latin deus.'
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