(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.
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(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.
2008: Fareed Zakaria, The Post-American World, Chapter VI
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Add your own interpretation of "cross the aisle".
Regional slang from around the English-speaking world — British, Australian, Irish, Caribbean, Nigerian, Filipino, AAVE, and the hyphenated-English dialects that make the internet sound local.
See all Regional & Other slang on Slangora.