YOU SAID:

Dumber than a doornail

INTO JAPANESE

ドアネイルよりもダム

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Dumb than the door nail

INTO JAPANESE

ドアネイルよりダム

BACK INTO ENGLISH

Dumb from the door nail

INTO JAPANESE

ドアネイルからダム

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From the door nail to the dam

INTO JAPANESE

ドアのくぎからダムへ

BACK INTO ENGLISH

From the door nail to the dam