The idiom "laugh one's head off" is rooted in the idea that someone finds something so hilarious that their laughter is so intense that it feels like it might cause their head to come off. While there is no specific historical origin for this expression, it is used to describe uncontrolled and hearty laughter, emphasizing the idea of laughing to an extreme degree.

Définition et signification de « laugh one's head off » en anglais

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