What does "bet" mean here?
Native speaker’s answer
Rebecca
"I'll bet [something]" is an informal expression that means something similar to "I'm sure" or "I expect." It is used when someone is confident about a guess or statement they are making. The speaker has used this expression to express his confidence that giving his friend a haircut will help calm him down. Ex: I'll bet school will be cancelled because of the snow. Ex: I'll bet Melissa will be late again. That's normal for her.