It's a toss-up whether oil prices will go up or down over the days ahead.

未来这些日子的油价涨落概率是一半对一半。

《柯林斯英汉双解大词典》

Elsewhere, it is a toss-up.

在别处，这是碰运气的事。

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Now, however, it's much more of a toss-up between the two rivals.

不过，现在这两个竞争对手之间的较量更加势均力敌了。

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But on the basis of usage, it's a toss-up as to which publication is more out-of-touch.

FORBES

Indiana, however, is a toss-up, and was the next campaign stop for both candidates.

NPR: Clinton Wins, But Dynamics of the Race Stay Same

The lead, though, remains close enough for pollsters to call the state a toss-up.

FORBES: Battleground States to Watch for This Election