The phrase "didst a turn" means to do a favor or a good deed for someone. Some antonyms for this phrase could be "neglected," "ignored," or "disregarded." When someone neglects to do a turn for another person, they are failing to fulfill their responsibilities or show kindness. Similarly, when someone ignores or disregards the needs of others, they are not doing a turn or extending help. On the other hand, some synonyms for "didst a turn" could be "lent a hand," "assisted," or "aided," all of which reflect a willingness to help and support others.