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hys‧ter‧ics
[plural] spoken
[plural] spoken1 when you are unable to control your behaviour or emotions because you are very upset, afraid, excited etc :
have hysterics (=be extremely upset or angry) British English 
Mum'd have hysterics if she knew what you'd done.
Mum'd have hysterics if she knew what you'd done.2 if someone is in hysterics, they are laughing and not able to stop : The audience was in hysterics.
in hysterics
The audience was in hysterics.