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New brooms sweep clean

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New brooms sweep clean.

 and A new broom sweeps clean.

Prov. Someone who is new in a particular job will do a very good job at first, to prove how competent he or she is. Jill: That new supervisor is awfully strict. Jane: New brooms sweep clean. The new teacher immediately flunked three of the laziest students. "A new broom sweeps clean," one of the students shrugged.

See also: broom, clean, new, sweep