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1. A large-scale removal of unwanted people or objects to expedite change. In an effort to save the company, the new CEO made a clean sweep and replaced everyone in the finance department. Wow, the garage looks completely different after our big clean sweep!
2. A victory by a large margin, especially one in which the opposing side accumulated none or a very small fraction of the votes, points, etc., required to win. Used especially in politics. The election was a clean sweep for the senator, who won in nearly every county. My team achieved a clean sweep at the national mathematics competition.
a broad movement clearing or affecting everything in its pathway. The manager and everybody in accounting got fired in a clean sweep of that department. Everybody got a pay rise. It was a clean sweep.
n. a broad movement clearing or affecting everything in the pathway. (Usually figurative.) Everybody got a raise. It was a clean sweep.