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English definition of “I bet”

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."Words and phrases expressing agreement and acceptance
(Definition of I bet from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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