cross the aisle

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Description: 
{{chiefly|British|and|Canada|idiomatic|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.
Ngram Text: 
cross the aisle
Source: 
Wiktionary
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Wiktionary tag: 
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