Word of mouth: information or reputation spread from person to person by spoken recommendation or hearsay.
その店は高評価の口コミで客が増えた。
That shop increased customers thanks to highly positive word-of-mouth.
友達の口コミでこの映画を知った。
I learned about this movie through a friend's recommendation.
良いサービスは口コミで広がりやすい。
Good service tends to spread by word of mouth.
Online reviews or user comments about products or services—reviews written on the internet.
新商品は発売前にネットの口コミで話題になった。
The new product became a topic online through pre-release reviews and buzz.
購入前に口コミをチェックして評判を確認した。
I checked online reviews to confirm the reputation before buying.
口コミサイトで評価が高いホテルを予約した。
I booked a hotel that had high ratings on review sites.