laugh it up (?.)

• be in stitches
• beguile the time
• break up
• burst into laughter
• burst out
• burst out laughing
• burst with laughter
• bust a gut
• cachinnate
• cackle
• chortle
• chuckle
• crow
• drown care
• giggle
• go into convulsions
• guffaw
• ha-ha
• have a ball
• have fun
• hee-haw
• hee-hee
• ho-ho
• horselaugh
• kill time
• laugh
• laugh outright
• live it up
• loosen up
• nearly die laughing
• relax
• roar
• roar with laughter
• shake like jelly
• shake with laughter
• shout
• shriek
• snicker
• snigger
• snort
• split
• split with laughter
• tee-hee
• titter
• yuk-yuk