Question 1

What does "all bets are off" mean?

Accepted Answer

The outcome of a situation is now uncertain because circumstances have changed unexpectedly.

Question 2

How do you use "all bets are off" in a sentence?

Accepted Answer

With the star player injured, all bets are off for the final match.

Question 3

Is "all bets are off" formal or informal?

Accepted Answer

"all bets are off" is register-neutral — appropriate in both casual and formal contexts. Used when a previously predictable situation has been disrupted by new developments.