YOU SAID:

This is why the custom was to place a coin in a dead mouth

INTO JAPANESE

これが、硬貨を死んだ口に入れる習慣があった理由です。

BACK INTO ENGLISH

This is why it was customary to put coins in the mouth of the dead.

INTO JAPANESE

そのため、死者の口に硬貨を入れる習慣がありました。

BACK INTO ENGLISH

Therefore, it was customary to put a coin in the mouth of the dead.

INTO JAPANESE

したがって、死者の口にコインを入れるのが通例でした。

BACK INTO ENGLISH

Therefore, it was customary to put a coin in the mouth of the dead.