Definition of it isn't over till the fat lady sings in English:

it isn't over till the fat lady sings

Used to convey that there is still time for a situation to change.
[by association with the final aria in tragic opera]
See parent entry: lady

Definition of it isn't over till the fat lady sings in:

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Word of the day dinkum
Pronunciation: ˈdɪŋkəm
adjective
(of an article or person) genuine, honest, true