responder
/responˈdeɾ/ · A2 · verb
to answer, to reply
📞 responder = respond + -er: the English word respond with a Spanish verb ending
From Latin respondere: re- (back) + spondere (to pledge), so to pledge back, to give something in return for what was said. English respond is the same word. Talking back and reacting are both ways of giving a reply back.