to laugh at;  to ridicule;  to mock;  to make fun of;  to sneer at
 to give a broad grin;  to smirk
 to smile cheerfully;  to crack a smile
 to give a little chuckle;  to let out a giggle
 to laugh mockingly;  to smile with contempt;  to jeer;  to sneer
 laughable;  ridiculous;  funny;  comical
 to guffaw;  to roar with laughter;  to laugh heartily
 to give a little chuckle;  to let out a giggle
 to give a broad grin;  to smirk
 to guffaw;  to roar with laughter;  to laugh heartily
 to have one's knees be about to give way
 to laugh scornfully;  to sneer at
 being unable to laugh (at a funny but serious situation);  forced to hold back laughter
 to be laughable;  to be unrealistic
 laugh and grow fat; (lit.) good fortune and happiness will come to the home of those who smile
 to laugh to oneself;  to smile to oneself
 the pot calling the kettle black; (lit.) the goop in the eye laughing at the snot in the nose
 take care of the penny; (lit.) he who makes fun of one yen will cry at one yen
 take care of the penny; (lit.) he who makes fun of one sen will cry at one sen
 he who laughs last, laughs best
 mountain in springtime when all of the tree buds open at the same time; (lit.) laughing mountain