The phrase "doth a turn" denotes the act of performing a particular task, favor, or service. Antonyms for this phrase would include neglecting, ignoring, overlooking, or dismissing such deeds. Essentially, the opposite of doing a turn would be failing to fulfill an obligation or disregarding an opportunity to assist someone. Acting selfishly or indifferently would be against the spirit of doing a turn, which is to lend a helping hand and provide support to others. To do a turn is an act of kindness, and antonyms for it reflect indifference or apathy towards others.