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Definition of Cross the aisle
1. Verb. (chiefly US idiomatic politics) To vote, unite, or otherwise co-operate with members of another political party in order to achieve governmental or political action. ¹
2. Verb. (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. ¹
¹ Source: wiktionary.com