Definition of lose one's mind (or one's marbles) in English:

lose one's mind (or one's marbles)

phrase

informal
  • Go insane.

    • ‘Tragically, his boat was later found adrift, no sign of him on board, and in a filthy cabin were the insane diary entries of one who had clearly lost his mind.’
    • ‘Sometimes the cause is not very clear and we think that we have lost our mind, that we are crazy.’
    • ‘So then I went to Nantucket and lost my mind for a minute.’
    • ‘Yes, I've probably lost my mind, but if that's true, I don't really care.’
    • ‘I lost my mind and I ran back home, trying to explain it to my mom.’
    • ‘A long time ago he began to lose his mind and he started imagining things that are not real.’
    • ‘I pretty much lost my mind between March and September.’
    • ‘She looked at me as if I had lost my mind, then she looked out the window.’
    • ‘But in his circles all neurological problems were known as having lost one's marbles.’
    • ‘She laughed, her eyes weren't focused and she seemed to have lost her mind and gone insane.’
    become insane, lose one's reason, lose one's mind, take leave of one's senses, go off one's head, go crazy
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