Placing a bet is read as staking something on an uncertain outcome — a decision, a person, your own judgement. The dream speaks of risk and trust, not of any result.
Where in your waking life have you met something like this lately?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.