The phrase "sets afoot" refers to the act of initiating or starting something. Synonyms for this phrase include launch, commence, begin, inaugurate, and instigate. On the other hand, antonyms for sets afoot include terminate, conclude, halt, cease, and finish. These words illustrate the opposite action of stopping or completing a task or event. It's essential to understand the antonyms for "sets afoot" to fully comprehend the meaning and context of a sentence. For example, "He sets afoot the plans for the project, but later concluded that it wasn't feasible to continue." Understanding the antonyms helps us understand that the project was halted or ended.