Phrasal Verb: Get back to

Meaning: Respond to a contact

Example: I'll GET BACK TO you as soon as I hear any news.

Meaning: Respond when you know the answer

Example: I don't know at the moment, but I will GET BACK TO you as soon as I have the information.

Meaning: Start doing something again after an interruption

Example: It took me ages to GET BACK TO sleep after the phone rang.