it ain't over till/until it's over

it ain't over till/until it's over

The final outcome cannot be assumed or determined until a given situation, event, etc., is completely finished. Usually used in reference to organized competitions, such as sporting events, political elections, and 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 it's over!" It's not looking likely that the senator will be elected to another term, but it ain't over until it's over.
See also: over, till, until
Farlex Dictionary of Idioms.
See also:
  • (Someone or something) called, they want their (something) back!
  • a bad apple spoils the (whole) barrel
  • a rotten apple spoils the (whole) barrel
  • a rotten apple spoils the (whole) bunch
  • a rotten apple spoils the (whole) bushel
  • bushel
  • one rotten apple spoils the (whole) barrel
  • one rotten apple spoils the (whole) bunch
  • one rotten apple spoils the (whole) bushel
  • rotten apple spoils the barrel