by word of mouth

1. see word of mouth.

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

Example Sentences

Produced for $40 and promoted by word of mouth, the cover image was of Lehrer in hell playing piano as the devil.

From Los Angeles Times

Advertisements for his services seem to spread by word of mouth.

From BBC

Despite the loss, Andres Salazar’s clients have stepped in to help by advertising his situation on social media and by word of mouth.

From Los Angeles Times

More than 500 workers turned up at the KIWA’s event, several hundred more than initially expected as word of the government program and the registration clinic spread by word of mouth.

From Los Angeles Times

From there, stories of Nguyen’s firearms proficiency spread by word of mouth.

From Los Angeles Times