Definition of "marbles" []

• Plural form of marble. (noun)
• Any of several children's games played with small glass balls. (noun)
• Sanity. (noun)
• Third-person singular simple present indicative form of marble. (verb)

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• "Losing your mind or losing your faculties or losing your marbles is about age – none of which was said."
• "Next in marbles were the sold colors, opaque or with a swirl through them."
• "A person, once normal, who loses his/her marbles, is properly called demented."