- I('ll) bet
- I('ll) bet1. Inf. I'm pretty sure that something is so or that something will happen. •
Bob: You're late. I bet you miss your plane. Rachel: No, I won't.
•Sue: I'll bet it rains today. Alice: No way! There's not a cloud in the sky.
2. Inf. I agree. (Often sarcastic.) •Tom: They're probably going to raise taxes again next year. Henry: I bet.
•Fred: If we do that again, we'll really be in trouble. Andrew: I'll bet.
Dictionary of American idioms. 2013.