The phrase "stuck one's neck out" typically means to take a risk or do something bold and potentially dangerous. Antonyms for this phrase could include playing it safe, avoiding risk, being cautious, passive, or staying within one's comfort zone. A person who doesn't want to stick their neck out might be described as a follower, conformist, or someone who goes along with the crowd. Avoiding sticking one's neck out could be seen as a strategy for avoiding conflict, staying out of trouble, or not attracting attention. While playing it safe can be a smart move, taking risks can sometimes lead to great rewards and personal growth.