cross the floor
join the opposing side in Parliament – British
The floor of the House of Commons is the open space separating members of the Government and Opposition parties who sit on benchesfacing each other across it.
RELATED IDIOMS :
from the floor
(of a speech or question) delivered by an individual member at a meeting or assembly, rather than by a representative on the platform
take the floor
begin to dance on a dance floor
speak in a debate or assembly
cross the floor :
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