It ain’t over till the fat lady sings.
More English Proverbs:
You'll always miss 100% of the [basketball] shots you don't take.English
Appearances can be deceiving.
English
An eel by his tail, an Irishman at his word.
English
A fox smells its own stink first.
English
Don't trust the Greek bearing gifts.
English
Children learn to creep before they can go.
English