Interposing is the act of inserting oneself or an obstacle between two parties. The antonyms for interposing would be to withdraw or remove oneself, to abstain from interfering, or to facilitate communication and understanding between the parties rather than creating a barrier. The opposite of interposing could be to mediate, negotiate or reconcile. Another antonym for interposing could be to collaborate or cooperate in finding a solution that is acceptable for both parties. While interposing may be necessary at times, finding alternatives to create a positive outcome can ensure better relationships in the long run.