1. information that is communicated verbally
grow/spread by word of mouth
The phrase ‘word of mouth’ refers to verbal communication. This phrase is usually used to talk about recommendations that are given from one person to another. ‘Word of mouth’ is considered a successful form of advertising as in when people recommend your product or service to a friend or family member. News and rumours can also spread by ‘word of mouth’. This is a common phrase usually used to talk about professional services.