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English definition of “word of mouth”

word of mouth

noun [U] (also word-of-mouth)     COMMERCE
the process of telling people you know about a particular product or service, usually because you think it is good and want to encourage them to try it: by/through word of mouth We get most of our clients by word of mouth. word-of-mouth advertising/recommendation
(Definition of word of mouth noun from the Cambridge Business English Dictionary © Cambridge University Press)
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