cross the floor

listen to the pronunciation of cross the floor
English - English
To vote against one’s own political party in parliament
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

Two weeks ago, Mr Davies intimated to Mr Brown that he was ready to cross the floor.

cross the floor
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