1
general::
Also, laugh away. Dismiss as ridiculous or trivial, as in He laughed off the suggestion that his career was over. [Early 1700s]
American Heritage Idioms
2
general::
Phrase(s): laugh something off
to treat a serious problem lightly by laughing at it. • Although his feelings were hurt, he just laughed the incident off as if nothing had happened. • He laughed off the incident.
McGrawhill's American Idioms And Phrasal Verbs