humorize
/ˈhjuːmərʌɪz/(also humourize, humorise, humourise)
verb
1 [with object] To make (something) humorous; to cast in an amusing light.
2 [no object] To speak or think humorously; to make amusing remarks or reflections.
Origin
Late 16th century (in an earlier sense). From humour or its etymon classical Latin hūmor + -ize.