Complete the letter analogy: CARD : ACDR :: TIME : ?

The four letters are taken two at a time and each couple changes places. In CARD the first two, C and A, become A and C, and the last two, R and D, become D and R, giving ACDR. Treating TIME the same way turns T, I into I, T and M, E into E, M, which reads ITEM. 'ITME' swaps only the first couple and 'TIEM' only the second. 'EMIT' is the whole word written backwards, a tidy-looking answer that fails on CARD, which reversed would be DRAC.