by word of mouth
US /baɪ wɜrd əv maʊθ/
UK /baɪ wɜrd əv maʊθ/

1.
melalui mulut ke mulut, secara lisan
through people telling each other rather than through advertisements, etc.
:
•
Most of our business comes by word of mouth.
Kebanyakan perniagaan kami datang melalui mulut ke mulut.
•
The news spread quickly by word of mouth.
Berita itu tersebar dengan cepat melalui mulut ke mulut.