1. Success achieved through personal recommendations and informal communication rather than paid advertising or marketing
The restaurant became a word-of-mouth success after receiving praise from early customers.
O restaurante se tornou um sucesso boca-a-boca depois de receber elogios dos primeiros clientes.
2. Growth or popularity generated organically through people telling others about a product, service, or business
The indie film achieved word-of-mouth success and eventually reached millions of viewers.
O filme independente conquistou sucesso boca-a-boca e eventualmente alcançou milhões de espectadores.