真的丟一枚銅板
這一家就是核心畫面本身，沒有任何比喻：手上真的有一枚銅板，落地哪一面就算數。
noun · B2
The act of throwing a coin up in the air so that the side it lands on decides something.
丟銅板（決定事情）
核心畫面
One way to hold this word is a coin spinning in the air. The moment it leaves the hand, nobody is deciding any more: the two faces have the same chance, and everyone just watches it land. Each use of toss-up keeps part of that moment — sometimes the real coin, sometimes only the feeling that two things are so equal that chance is all that is left.
可以想成一枚銅板正在空中翻。銅板一離手，就沒有人能再做主了：正面和反面機會一樣，大家只能看它落地。toss-up 的…更多收起
可以想成一枚銅板正在空中翻。銅板一離手，就沒有人能再做主了：正面和反面機會一樣，大家只能看它落地。toss-up 的每個用法都留著這個畫面的一部分——有時候是真的那枚銅板，有時候只剩下「兩邊太接近，只能交給運氣」的那種感覺。From the word’s history
Wiktionary records toss-up as formed from the verb phrase toss up, and connects it to tossing a coin. So the noun starts at the coin itself, and the even-chance meaning follows from what a coin toss is like.
Wiktionary 記載 toss-up 來自動詞片語 toss up，並指出它跟丟銅板有關。所以這個名詞的起點就是那枚被丟上去的銅板；「兩邊機會一樣」的意思，是從丟銅板這件事本身長出來的。
Wiktionary (packet extract), entry 'toss-up' (noun): 'Deverbal from toss up, suggesting tossing a coin.' — kaikki:3f6f69a190036ae4:917406001:8591
Two branches
兩邊一樣，說不準
把銅板從畫面裡拿掉，只留下「機會各半、誰也幫不上忙」的那種感覺，就得到這一家。銅板不見了，但那一刻的不確定留了下來。
noun · B2
A situation or a choice in which two results are equally likely, or two options are equally good, so nobody can say which will happen or which is better.
勢均力敵的局面