Meaning of “I bet” in the English Dictionary

british dictionary

"I bet" in British English

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I bet

also I'll bet informal

said to show that you understand why someone has a particular opinion or feels a particular way:

"I'm so annoyed with her." "I'll bet."
"I was so relieved I didn't have to clean up after the party." "I bet you were."

(Definition of “I bet” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)