The idiomatic expression "goes out on a limb" refers to taking a risk or making a bold decision that is not easy or safe. The antonyms for this phrase can imply conservatism, prudence, and reluctance to take risks. Some possible antonyms include playing it safe, being conservative, avoiding risk, taking a cautious approach, or staying within one's comfort zone. These antonyms suggest that individuals who do not go out on a limb may miss out on opportunities, but they are less likely to experience failure or negative consequences. Ultimately, whether to go out on a limb or not depends on the individual's willingness to take risks, their confidence in their abilities, and the potential rewards and costs of their decision.