Wiktionary
laugh off
vb. (context transitive English) To respond to a negative situation lightheartedly, as though it were a joke.
WordNet
laugh off
v. deal with a problem by laughing or pretending to be amused by it; "She laughs away all these problems" [syn: laugh away]
Usage examples of "laugh off".
Every time he tried to laugh off what the Jew said as just another atrocity story, he kept remembering the scar on the side of Max's neck and the Jewish partisan's obscenely embellished tale of slaughter and horror at Babi Yar.
To be able to laugh off your troubles indicates a certain detachment from life, as though you did not need to be involved.
Our fathers would curse us, and this was something neither of us could laugh off.