B1
something that you say to show that you believe that something is true or will happen
Dictionary examples:
I bet you my cat is secretly plotting world domination. (0.0)
I bet you my phone is hiding from me on purpose. (0.0)
I bet your alarm clock is laughing at you every morning. (0.0)
I bet you she's missed the bus. (26.0)
I bet that he won't come. (37.4)