冤大头（yuān dà tóu）

Fool; a person who spends time or money but gets no return; a person who is fooled or cheated.

例：他后悔没听我的话，结果如今成了冤大头。

（tā hòu huǐ méi tīng wǒ de huà, jié guǒ rú jīn chéng le yuān dà tóu.）

He regrets not listening to me. Now he looks like a fool.

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