It's not over until the fat lady sings

It's not over until the fat lady sings.

  (informal)
something that you say when someone is losing a game or competition but you think there is still a chance they might win Tony's only two games behind. And as they say, it's not over until the fat lady sings.
See also: fat, lady, not, sing, until
References in periodicals archive ?
But it's not over until the fat lady sings, or in this instance the thin lady whips up 29 foeettes on tournate and is held triumphantly overhead one-handed by her partner.
Finally, despite Boyle being favourite to win and Albion favourites to come last, both Britain's Got Talent and West Bromwich Albion know it's not over until the fat lady sings.
IT'S not over until the fat lady sings goes the saying, but on The Voice UK it's not over until the chairs stop turning.
The Crusaders need a minor miracle to qualify for the play-offs, hoping that winless Gateshead Thunder beat Oldham, but he knows that it's not over until the fat lady sings.
Well, they do say it's not over until the fat lady sings.
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