lose one's marbles
成語所屬單字marble
lose one's marbles — 慣用語
1. to become crazy or mentally confused, especially as a result of old age
1.慣用語
釋義
喪失理智；發瘋
to become crazy or mentally confused, especially as a result of old age
例句
Grandfather keeps talking to the television — I think he is losing his marbles.
Anyone who tries to climb that wall in the rain must have lost their marbles.