to laugh something off ------ 不当回事

英文释义
To not take something seriously; to dismiss the importance of something by laughing at it.

例句
My brother is afraid of doctors, so yesterday when he became dizzy and fell down, he laughed it off and didn't go to the hospital.
我兄弟害怕看医生，所以昨天当他感到头晕并跌倒时，他并不当回事，也不去医院。