1. a situation in which the outcome is uncertain or could go either way
Usage: informal
2. the act of throwing a coin in the air to decide something

Examples

• The election is a complete tossup between the two candidates.
• It’s a tossup whether we’ll have good weather for the picnic.
• The game was decided by a tossup at the beginning.
• Between pizza and burgers, it’s really a tossup for me.
• The referee used a coin tossup to determine which team would kick off first.
• With both teams equally matched, the championship is anyone’s tossup.