it ain't over till/until the fat lady sings

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it ain't over till/until the fat lady sings

The final outcome cannot be assumed or determined until a given situation, event, etc., is completely finished. ("Ain't" is a colloquial contraction of "is not.") The phrase refers to the stereotypically overweight female sopranos of the opera, particularly the Valkyrie Brünnhilde, whose aria concludes Richard Wagner's opera cycle Der Ring des Nibelungen. It is often used in reference to organized competitions, such as sporting events, political elections, or the like. A: "We're down by six points with only two minutes remaining. There's no way we can win now!" B: "Hey, it ain't over till the fat lady sings!" It's not looking likely that the Senator will be elected to another term, but it ain't over until the fat lady sings.
See also: fat, lady, sing, till, until
References in periodicals archive ?
The next few weeks will be hard for all us Buddies but, as they say, it ain't over until the fat lady sings.