bn:00032000n
Noun Concept
EN
tossup  toss-up  even chance
EN
An unpredictable phenomenon WordNet 3.0
Definitions
Examples
Relations
Sources
EN
A chance in which success is just as likely as failure. Wiktionary
EN
It's a toss-up whether he will win or lose WordNet 3.0 & Open English WordNet
IS A
WordNet 3.0 & Open English WordNet
Wiktionary