word of mouth

informal oral communication: The rumor spread rapidly by word of mouth.


word-of-mouth, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The invitations were by word of mouth to neighbors and personal notes to the
  groom's relatives at a distance.
We know them not due to word of mouth, but by the authentication of the written
  works of those who were there.
Word of mouth may send you to that world, as may reviews.
Information also travels informally, thru word of mouth, impossible to get at
  with technology.
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