Going out on a limb is an idiomatic expression that means taking a risk, especially when you don't have a lot of support or safety net. Some antonyms for this phrase include "playing it safe," "being cautious," and "sticking to convention." These phrases suggest a preference for a more conservative approach, where risks are minimized or avoided altogether. While it's important to be careful and thoughtful when making decisions, sometimes taking a chance can lead to great rewards. It's all about finding the right balance between safety and adventure, and knowing when to make calculated risks.