lose one's marbles

Verb

 * 1) * 1981 April 13, New York magazine, vol. 14, no. 15,
 * There it was again, the suggestion that the governor had lost his marbles. And, to be truthful, Breslin is a bit late on the loony angle.
 * There it was again, the suggestion that the governor had lost his marbles. And, to be truthful, Breslin is a bit late on the loony angle.