There are several words that can be considered antonyms of the phrase "be netting". The term "netting" refers to the act of catching something in a net, while the antonyms describe the opposite of that action. One such antonym is "losing", which refers to failing to retain or keep something. Another antonym is "releasing", which means letting go of something that was once caught or contained. Other antonyms include "missing", "failing", and "letting slip", all of which are characterized by not achieving the desired outcome of catching or retaining something.