toss up

名词 toss up:

1. an unpredictable phenomenon
   同义词：tossup, toss-up, even chance

1. Let's toss up a penny for the chance to go first.
   我们掷一枚一便士的硬币来决定谁先去。
2. Who's going to cook tonight? Let's toss up.
   今晚谁做饭? 咱们掷硬币决定吧。