The phrase "sticking neck out" means to take a risk or put oneself in a vulnerable position. The antonyms, or opposite meanings to this could include playing it safe, avoiding risks or keeping a low profile. It is important to consider the pros and cons before sticking one's neck out as it could lead to either success or failure. Sometimes, it may be necessary to take a chance and stand out from the crowd, but it is equally important to know when to step back and avoid unnecessary risks. Synonyms for playing it safe could include being cautious, taking a measured approach, and minimizing risks.