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toss-up (n.)
[toss-up 词源字典]
"even matter," 1809, from earlier sense of "a flipping of a coin to arrive at a decision" (c. 1700), from verbal phrase, from
toss
(v.) +
up
(adv.).
[toss-up etymology, toss-up origin, 英语词源]
[toss-up 词源字典]