word of mouth

Little-known outside academic circles, the RIE philosophy has spread among parents via word-of-mouth.

Word-of-mouth publicity accounts for the gradual steady growth in the use of the rooms.

Ibrhm; matters were sent also by word-of-mouth; and he was given leave to go.

This will be an unceremonious summary of a word-of-mouth message.

But it was by word-of-mouth invitation that I was in her kitchen yesterday morning.

You might hear the warning given on radio or television, or even by word-of-mouth.