Nihoner

“Forbidding someone from telling others” in Japanese

Short answer
口固め kuchigatame くちがため

Forbidding someone from telling others in Japanese is “口固め” (kuchigatame). Full meaning: verbal promise; forbidding someone from telling others.

Looking for the other direction? Search any Japanese word in the Nihoner lexicon, or practise what you have learned in the learning games.