Idiom of the day :- Lose one’s marbles

Usage, examples and definition of the Idiom :-

In slang, the term ‘marbles’ refers to (1) a person’s common sense; or (2) his or her sanity. ‘What ? You’re going to bet all your money on one horse ? Have youlost your marbles ?’ ( Common sense ) ‘The way Yvonne keeps shouting makes me wonder if she hasn’t lost her marbles.’ ( Sanity )