A situation in which the outcome cannot be predicted or a decision between two things is very close. I don't know which team will win. Both have done so well this season that it's a real toss-up. Should I take the entry level position, or go back to school? It's really a toss-up in my mind.
toss something up
to throw something upward to a higher place or up into the air. He tossed the coin up, calling "heads" and hoping for the best. He tossed up the coin.
1. To throw something into the air: The graduates tossed up their hats in celebration. The referee tossed the ball up for the tip-off.
2. Sports To execute some type of throw or a throw with some outcome: The quarterback tossed up a Hail Mary pass. The basketball player tossed a three-pointer up.
3. To flip a coin to decide an issue: Let's toss up to see who goes first.
n. a matter of chance. (As predictable as the outcome of the toss of a coin.) Nobody knew what to do. It was a toss-up.