Taking a stab at something means making an attempt or guessing at something without much certainty. Antonyms for this phrase could include being certain, having a clear plan, or being decisive. Other options might be avoiding risk, playing it safe, or waiting for more information before acting. Some related phrases that have opposite meanings could include sitting on the sidelines, avoiding confrontation, or being content with the status quo. Ultimately, the opposite of taking a stab involves having a clear direction or plan, feeling confident in your decisions, and avoiding risky or unpredictable situations.