laugh off意为“一笑置之；对…一笑置之；对…付之一笑”。

【例句】
Frank tried to laugh off his aunt’s worry. 
弗兰克试图对他姑妈的烦恼一笑置之。

An actor has to learn to laugh off bad reviews.
演员需学会能对贬斥性评论一笑置之的本事。