laughing
adjective /ˈlɑːfɪŋ/
  /ˈlæfɪŋ/
Idioms - showing that you think something is funny; showing happiness- his laughing blue eyes
- laughing faces
 Oxford Collocations DictionaryLaughing is used with these nouns:- fit
- gas
 
Idioms 
be no laughing matter 
- to be something serious that you should not joke about                                     
die laughing 
- to find something extremely funny- I nearly died laughing when she said that.
 
split your sides (laughing/with laughter) 
- to laugh a lot at somebody/something