YOU SAID:

don't gift a horse in the mouth

INTO JAPANESE

口の中で馬を贈らないでください

BACK INTO ENGLISH

Do not give a horse in your mouth

INTO JAPANESE

馬を口に入れないでください

BACK INTO ENGLISH

Do not put the horse in your mouth

INTO JAPANESE

馬を口に入れないでください

BACK INTO ENGLISH

Do not put the horse in your mouth