People did word of mouth after tasting food at the newly opened restaurant.
People gave word of mouth after tasting food at the newly opened restaurant.
People made word of mouth after tasting food at the newly opened restaurant.
Please check them, especially "did, gave, and made".
Those examples are all unnatural. The phrase is almost always 'by word of mouth . Eg The news that the food at the new restaurant was delicious spread though the neighborhood by word of mouth.
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Those examples are all unnatural. The phrase is almost always 'by word of mouth.
Eg The news that the food at the new restaurant was delicious spread though the neighborhood by word of mouth. It means that people told other people.
Clive