even chance
Noun
Meaning
an unpredictable phenomenon
Source: WordNetSynonyms
toss-up
tossup
potential
future
risk
hit
advantage
break
chance
probability
lot
outcome
odds
prospect
toss
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Antonyms
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Examples
it's a toss-up whether he will win or lose
Marder p. 169 The system of testing shells, which remained in use up to 1944, meant that, statistically, a batch of shells of which 70% were faulty stood an even chance of being accepted.
This gives the partnership a better than even chance of success in making the contract, whereas without a response (and without Stayman), the contract would likely be set.