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Definition of Clean sweep
1. Noun. (chiefly politics) A complete or overwhelming victory, especially one in which all or almost all possible electoral contests are won. ¹
2. Noun. (sports) The winning, by a person or team, of all the possible possible prizes, games, rounds or contests, etc in a competition, season or series. ¹
3. Noun. A thorough change of policies, personnel or things, removing or replacing all or almost all of what was there previously. ¹
¹ Source: wiktionary.com