laugh (something) off
Definition: to pretend that a situation or comment is amusing and unimportant, when in reality it is serious or upsetting.
E.g.1: Bill laughed off the insult, but Jane knew that it had hurt him.
E.g.2: When he was accused of corruption, the politician tried to laugh the matter off by saying that he wasn’t important enough to be bribed.
This phrasal verb can be separated. (E.g. 2)