YOU SAID:
water off a ducks back
INTO JAPANESE
バックのアヒルを水します。
BACK INTO ENGLISH
Back duck, water will.
INTO JAPANESE
水はアヒルをバックアップします。
BACK INTO ENGLISH
Water backs up the ducks.
INTO JAPANESE
水はアヒルをバックアップします。
BACK INTO ENGLISH
Water backs up the ducks.
That didn't even make that much sense in English.