The popular idiom "lost their marbles" is a colloquial phrase used to describe someone who is acting erratic, irrational, confused, or temporarily insane. The expression derives from the children's game of marbles, where losing your glass spheres symbolized losing your focus, skill, or game pieces. Over time, it entered everyday English as a lighthearted or dramatic way to characterize bizarre behavior, poor decision-making, or mental confusion in high-stress situations.
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