COMMENTARY on 12:27
A. Yusuf Ali:

Translation:
"But if it be that his shirt is torn from the back, then is she the liar, and he is telling the truth!" 1674
Commentary:

1674  If Joseph's shirt was torn at the back, he must obviously have been retreating, and the wife of the 'Aziz must have been tugging from behind. No one could doubt who was the guilty party. Everybody saw it, and the 'Aziz was convinced. (R).