cross the floor

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cross the floor (third-person singular simple present crosses the floor, present participle crossing the floor, simple past and past participle crossed the floor)

  1. (Britain, politics, of a member of a parliament) To vote against one’s own political party in parliament.
  2. (Britain, informal, politics, of a member of a parliament) To resign from one’s political party and join another party, resulting in moving from one’s currently assigned desk or seat in the legislative chamber to a new desk or seat physically located with the other members of one’s new party.

Usage notes[edit]

  • Potentially applicable to any parliament structured according to the Westminster system (and only such parliaments).