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toss-up (n.)

"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.).

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Definitions of toss-up from WordNet

toss-up (n.)
an unpredictable phenomenon;
it's a toss-up whether he will win or lose
Synonyms: tossup / even chance
From wordnet.princeton.edu