"Ich gebe ihm Kontra."
Thanks so much! Sometimes Duolingo is good at providing a window into a whole phrase, such as, "to contradict (someone)," or "to hit back at (someone)," but in this case there was just a translation of "Kontra" that did not make sense in the sentence. Thank you also for the link to the excellent dictionary. http://en.pons.eu/german-english/ Wouldn't it help if the sentence at the top of this discussion page were translated?