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work like a charm

Function very well, have a good effect or outcome, as in That knife-sharpener works like a charm, or Her deferential manner worked like a charm; he agreed to everything they'd asked for. This expression uses charm in the sense of “a magic spell.” [Mid-1800s] Also see work wonders.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.