it isn't over till the fat lady sings - significado y definición. Qué es it isn't over till the fat lady sings
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Qué (quién) es it isn't over till the fat lady sings - definición

COLLOQUIALISM OFTEN USED AS A PROVERB
The fat lady sings; It isn't over until the fat lady sings; Fat lady; It isn't over 'til the fat lady sings; It ain't over until the fat lady sings; It ain't over til the fat lady sings; It ain't over till the fat lady sings.; It ain´t over ´til the fat lady sings; The opera isn't over til the fat lady sings; The fat lady hasn't sung yet; It ain't over 'til the fat lady sings; It's not over until the fat lady sings; It is not over until the fat lady sings
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[[Amalie Materna]] as the [[valkyrie]] [[Brünnhilde]] (1876)

It ain't over till the fat lady sings         
"It ain't over till (or until) the fat lady sings" is a colloquialism which is often used as a proverb. It means that one should not presume to know the outcome of an event which is still in progress.
till         
GLACIAL SEDIMENT
Glacial till; Glacial deposit; Tillite; Glacial till plains; Glacial deposits; Lodgement till; Supraglacial till
n.
money drawer
to have one's finger(s) in the till ('to steal from a money drawer')
till         
GLACIAL SEDIMENT
Glacial till; Glacial deposit; Tillite; Glacial till plains; Glacial deposits; Lodgement till; Supraglacial till
till1
¦ preposition & conj. less formal way of saying until.
Origin
OE til, of Gmc origin (not, as is commonly assumed, a shortened form of until).
Usage
Although till and until are generally interchangeable, till is usually considered to be more informal and occurs less frequently than until in writing. Until also tends to be the natural choice at the beginning of a sentence: until ten years ago, the drug was used as an illegal stimulant.
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till2
¦ noun a cash register or drawer for money in a shop, bank, or restaurant.
Origin
ME (in the sense 'drawer or compartment for valuables'): of unknown origin.
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till3
¦ verb prepare and cultivate (land) for crops.
Derivatives
tillable adjective
tillage noun
Origin
OE tilian 'strive for, obtain by effort', of Gmc origin; ult. related to till1.
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till4
¦ noun Geology boulder clay or other sediment deposited by melting glaciers or ice sheets.
Origin
C17 (orig. Scots, denoting shale): of unknown origin.

Wikipedia

It ain't over till the fat lady sings

"It ain't over till (or until) the fat lady sings" is a colloquialism which is often used as a proverb. It means that one should not presume to know the outcome of an event which is still in progress. More specifically, the phrase is used when a situation is (or appears to be) nearing its conclusion. It cautions against assuming that the current state of an event is irreversible and clearly determines how or when the event will end. The phrase is most commonly used in association with organized competitions, particularly sports.