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gen.	burst one's sides laughing (with); split one's sides laughing (with); crease up; die laughing; split sides with laughing; die with laughter; burst one's sides with laughter
Gruzovik, inf.	split one's sides with laughing; die laughing
idiom.	laugh oneself to death (Andrey Truhachev)
Makarov.	curl up; laugh till one's sides ache
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gen.	die laughing; split sides with laughing
Gruzovik, inf.	split one's sides with laughing; die laughing

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Informal

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