Antonyms for the phrase "cross threshold" could include staying put, remaining stagnant, or avoiding change. These antonyms suggest a reluctance to venture beyond one's comfort zone or to engage in new experiences. Another antonym could be retreat, indicating a movement away from a situation or opportunity rather than towards it. Additionally, other antonyms could be to stop, hesitate, or be indecisive, indicating a lack of forward motion or progress. While crossing a threshold can be daunting or uncomfortable, it often represents an important step towards growth and personal development. By embracing change and taking risks, individuals can overcome their fears and achieve their goals.