One of the mysteries of the English language finally explained.
A person who or thing which effects fundamental or numerous alterations; especially a newly appointed person who vigorously sets about making changes in personnel, procedures, etc.
Late 18th century; earliest use found in Frederick Reynolds (1764–1841), playwright. From new + broom, with allusion to the proverb new brooms sweep clean.
new broom/ˌnjuː ˈbruːm/
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