word of mouth

Noun

idiomatic uncountable

(idiomatic) Verbal means of passing on information.

Japanese Meaning

口コミ / 口頭で伝えられる情報伝達（噂や評判など）

Our small bakery grew its customer base entirely through word of mouth.

私たちの小さなベーカリーは口コミだけで顧客を増やしました。

Sense（1）

(idiomatic) Verbal means of passing on information.

The book didn't need to be advertised; it became popular solely by word of mouth.