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general::
Phrase(s): write something back to someone
to write a letter answering someone. • I wrote an answer back to her the same day that I received the letter. • Will you please write something back to Julie? She complains that you are ignoring her. • I wrote a letter back to Harry, explaining what had happened., Phrase(s): write back to someone
to write a letter to someone in return for a letter received from someone. • I wrote back to her at once, but I have heard no more from her. • Please write back to me when you have a chance.
McGrawhill's American Idioms And Phrasal Verbs