laugh something off
phrasal verb with laugh verb [ I ] uk/lɑːf/ us/læf/
对…一笑置之
to make yourself laugh about something unpleasant in order to make it seem less important or serious
She tried to laugh off their remarks, but I could see she was hurt. 她试图对他们的话一笑置之，但我看得出她的内心还是受到了伤害。