v.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.