'Back' in the Bible

And day after day Mordecai used to walk back and forth in front of the court of the harem in order to learn how Esther was doing and what might happen to her.

In the evening she went, and in the morning she returned to a separate part of the harem, to the authority of Shaashgaz the king's eunuch who was overseeing the concubines. She would not go back to the king unless the king was pleased with her and she was requested by name.

he said to take back this answer to Esther:

The king then removed his signet ring (the very one he had taken back from Haman) and gave it to Mordecai. And Esther designated Mordecai to be in charge of Haman's estate.