Puts on the line is an idiom that means to risk something important or valuable. The antonyms for puts on the line would be words that indicate safety, certainty, or stability. Some possible antonyms could be "protect," "preserve," "safeguard," "keep," "maintain," "secure," or "ensure." These words suggest actions or states of being that avoid risk or danger and prioritize safety and stability. When we use antonyms for puts on the line, we aim to reinforce the idea of security and stability, emphasizing the importance of taking care of what we already have and avoiding unnecessary risks.