The phrase "didst business for" implies that someone has conducted a transaction or carried out a task on behalf of someone else. Antonyms for this phrase could include words like "dissociate," "separate," or "disengage," which suggest a detachment or lack of involvement. Other antonyms might be "avoid," "neglect," or "ignore," implying a deliberate avoidance of business or transactions. Additionally, antonyms could include phrases like "did not engage in," "refrained from," or "abstained from," indicating a lack of participation or activity in business dealings. The opposites of "didst business for" imply a disconnection or refusal to participate, rather than active engagement.