1. The election was a toss-up, the winner still hasn''t been determined.
    这场选举胜负难分，截至目前还不知鹿死谁手。

1. (发生几率各半的)相等机会;难以定夺的事
    If you say that it is a toss-up whether one thing will happen or another thing will happen, you mean that either result seems equally likely.

toss-up是什么意思

    e.g. It''s a toss-up whether oil prices will go up or down over the days ahead.
           油价在今后的日子里会上涨还是下跌都有可能。

1. an unpredictable phenomenon

    e.g. it''s a toss-up whether he will win or lose

    Synonym: tossupeven chance