Antonyms for the phrase "sets astir" may include words like "calms," "quiets," "stills," or "soothes." These antonyms suggest a sense of tranquility and stillness rather than the movement and energy implied by "sets astir." Other possible antonyms could be "dulls," "lulls," "subdues," or "depresses," which indicate a sense of reducing positive energy or vitality. Overall, antonyms for "sets astir" would be words that suggest a lack of movement, energy, or excitement, and instead imply a sense of calm, stillness, or even lethargy.