be missing some of (one's) marbles

(redirected from be missing some of one's marbles)

be missing some of (one's) marbles

To be or become mentally deficient, incompetent, or deranged; to become 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!
See also: marble, missing, of