Definition of split one's sides North American also split a gut in English:

split one's sides (North American also split a gut)

informal Be convulsed with laughter.
More example sentences
  • This year they will have audiences splitting their sides with laughter with their crazy antics.
  • They can bring tears or make people split their sides with laughter.
  • Everyone split their sides, they were laughing so hard.
roar with laughter, laugh, guffaw, roar, laugh loudly, howl with laughter, dissolve into laughter, be creased up, be doubled up
informal fall about, crack up, be in stitches, be rolling in the aisles, laugh fit to bust
See parent entry: split

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cause (someone) to lose confidence or hope