口伝え

プログレッシブ和英中辞典(第4版)

くちづたえ【口伝え】

〔口碑〕an oral tradition；〔口頭〕transmission by word of mouth；〔口授〕oral instruction

爆発のうわさが口伝えに広まった
A rumor that there had been an explosion spread far and wide (by word of mouth).

口伝えで７時に駅に集合という指示が全員に出た
We all received oral instructions to meet at the station at seven o'clock.

出典　小学館「プログレッシブ和英中辞典(第4版)」