YOU SAID:
Don't check a gift horse in the mouth
INTO JAPANESE
口の中で贈り物の馬をチェックしないでください
BACK INTO ENGLISH
Don't check the gift horse in the mouth
INTO JAPANESE
口の中でギフト馬をチェックしないでください
BACK INTO ENGLISH
Don't check the gift horse in the mouth
That didn't even make that much sense in English.