IdiomThe AbsurdEnglish

lose one's marbles

Meaning: To go crazy.

Example: “Talking to the tomatoes doesn't mean Grandpa has lost his marbles.”

Origin: "Marbles" for wits is American slang from the late 19th century, perhaps from a child's grief at losing the game's marbles, or from a mishearing of French "meubles," one's furniture and so one's belongings.

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