Sarcastic "Yeah, sure"

IBET

Think of a phrase you might say when playfully doubting someone’s unlikely claim, often starting with "I."

This clue plays on the sarcastic tone of "Yeah, sure" as a way to express doubt rather than agreement. The phrase "I bet" is often used in the same sarcastic way—like saying "I bet you did" when you don’t actually believe someone. The answer "IBET" shortens that phrase while keeping the same skeptical, mocking flavor. The wordplay relies on how both expressions sound like they’re agreeing but really mean the opposite.