YOU SAID:

The custom is to place a coin in a dead mouth

INTO JAPANESE

硬貨は死んだ口に入れるのが習慣

BACK INTO ENGLISH

It is customary to put coins in the mouth of the dead

INTO JAPANESE

死者の口に硬貨を入れる習慣がある

BACK INTO ENGLISH

It is customary to put a coin in the dead man's mouth

INTO JAPANESE

死者の口に硬貨を入れるのが習慣

BACK INTO ENGLISH

It is customary to put a coin in the mouth of the deceased

INTO JAPANESE

故人の口に硬貨を入れる習慣がある

BACK INTO ENGLISH

It is customary to put a coin in the mouth of the deceased