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marbles (Noun (plural))
Small, hard, round balls made of glass, clay, or stone used in children's games. It is also used informally to refer to a person's mental faculties or sanity.
Think of your brain cells as little glass 'marbles'. If they roll away, you 'lose your marbles' and go crazy!
He lost marbles. → He lost his marbles.
The floor is made of marbles. → The floor is made of marble.
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