Wiktionary
answer back
vb. 1 (context idiomatic English) To reply impertinently; to talk back. 2 To reply to a question at a later time. 3 (context computing English) To issue echo characters, protocol responses, reflexive connection requests, etc.
Usage examples of "answer back".
Meanwhile Sebastian had flung open the folding doors leading into the dining-room with rather more noise than he need, for he was feeling furious, although he did not dare answer back when Fraulein Rottenmeier spoke to him.