Definition
Used to express disbelief about something heard, often because it seems highly improbable or unexpected.
我聽錯了吧（表示難以置信）
She said she's going to quit her job? I must be hearing things.
她說她要辭職？我一定聽錯了。
You're saying he actually agreed? I must be hearing things.
你說他真的同意了？我一定聽錯了。
They're saying they'll provide all items for free? I must be hearing things.
他們說要免費提供所有物品？我一定聽錯了。