From Longman Dictionary of Contemporary Englishanswer back phrasal verbANSWER/REPLYto reply in a rude way to someone that you are supposed to obeyanswer somebody back Don’t answer me back young man! → answer→ See Verb table
Examples from the Corpus
answer back• I'd generally talk him round, but never answer back.• She shouldn't have said that, she shouldn't have answered back.• The child's refusal to comply may not seem as bad as the child's habit of answering back.• Sometimes, though, the urge to answer back is just too strong.• At school he dared answer back to the Headmaster - politely - when he felt he was in the right. 