belly laugh 
noun
A loud unrestrained laugh: her mutter of amusement blossomed into an enormous belly laugh...
- Wouldn't a friendship be better if it could absorb the energy of teasing and laugh a big belly laugh?
- I found Barron very funny, but it was more of a quiet chuckle than a belly laugh.
- Hardly a minute goes by without a chuckle or a belly laugh.
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