lose one's marbles

idiom
Updated on: 15 Nov 2017

Definition of lose one's marbles

informal + humorous
: to become insane
  • When he started ranting about how the government was out to get him, I thought he'd lost his marbles.

Word by Word Definitions

lose play
  1. : to bring to destruction

  2. : damn

  3. : to miss from one's possession or from a customary or supposed place

marble play marbles
  1. : limestone that is more or less crystallized by metamorphism, that ranges from granular to compact in texture, that is capable of taking a high polish, and that is used especially in architecture and sculpture

  2. : something (such as a piece of sculpture) composed of or made from marble

  3. : something suggesting marble (as in hardness, coldness, or smoothness)

  1. : to give a veined or mottled appearance to


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