be missing some of (one's) marbles
be missing some of (one's) marbles
To be mentally deficient, incompetent, or deranged; to be of unsound mind. My poor grandmother is missing some of her marbles after her stroke. I've been so sleep deprived lately that it feels like I'm missing some of my marbles! You can't tell people you want to start a business selling bees as pets—they'll think you're missing some of your marbles!
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