split (your) sides (laughing)

to laugh a lot at something.

We nearly split our sides laughing watching Paul trying to give the rabbit a bath.

• the plot thickens
• the plot thickens.
• the point of no return
• the pot calling the kettle black
• the power behind the throne
• the powers that be
• the primrose path
• the prodigal son
• the promised land
• the proof of the pudding .
• the proof of the pudding
• the proof of the pudding is in the eating
• the proof of the pudding is in the eating.
• the pros and cons
• the rank and file
• the real McCoy
• there and then
• There are no flies on .
• There are no flies on someone.
• There are plenty more where that came from.
• There are plenty more where they came from.
• There but for the grace of God .
• There but for the grace of God go I.
• Thereby hangs a tale.
• the received wisdom