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toss-up
1 used when you do not know which of two things will happen, or which of two things to choose :
I don't know who'll get the job - it's a toss-up between Carl and Steve.
it's a toss-up
spoken
I don't know who'll get the job - it's a toss-up between Carl and Steve.2 [countable usually singular] British English an act of tossing a coin in order to decide something
