ˈtoss-up noun1. it’s a toss-up spoken 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.2. [countable usually singular] British English an act of tossing a coin in order to decide something
[TahlilGaran] Dictionary of Contemporary English ▲