"Taking under wing" means to take someone or something under one's protection or guidance. Its antonyms could be "abandon," "neglect," or "disown." When someone abandons or neglects someone or something, they leave them to fend for themselves and do not provide any support or guidance. Similarly, disowning something means to reject and abandon it altogether. "Shunning" and "ignoring" could also be used as antonyms for "taking under wing." Therefore, when someone shuns or ignores something, they deliberately avoid any interaction or participation, which is the opposite of what one would do when taking something under their wing.