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]
See also: of, word
References in periodicals archive ?
With Judy's Book free online marketing services, local businesses will be able to leverage what has traditionally been one of the most effective forms of local marketing, word of mouth, by managing a listing created by consumers who have had a personal experience with their company.