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Idioms and Phrases with word of mouth, by

word of mouth, by

Orally, by one person telling another, as in They don't advertise; they get all their customers by word of mouth. [Mid-1500s]

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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.