From Longman Dictionary of Contemporary Englishget back to somebody phrasal verb informalANSWER/REPLYto talk to someone or telephone them later in order to answer a question or give them information I’ll find out the prices and get back to you. → get→ See Verb table
Examples from the Corpus
get back to • I was told they would look into my case and get back to me.From Longman Business Dictionaryget back to somebody phrasal verb [transitive] to talk or write to someone about something you had discussed together earlierI left my name and number so they could get back to me. → get→ See Verb table 