The idiom "leg to stand on" is believed to have originated in the 17th century. It is thought to have come from the practice of dueling, in which a duelist who was wounded or unable to stand was said to have no leg to stand on and was therefore at a disadvantage. This idiomatic expression came to be used to describe someone who had no support or justification for their position or opinion.

Définition et signification de « leg to stand on » en anglais

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