The phrase "went all out" is often used to describe someone who has put in extreme effort or gone to great lengths to accomplish something. Its antonyms, on the other hand, describe actions that are less intense or restrained. Some possible antonyms of "went all out" include "held back," "took it easy," "held off," or "played it safe." While these phrases convey a more cautious approach, they may also imply a lack of ambition, determination, or passion. Antonyms can provide a different perspective on a word or phrase and help us understand its various nuances and connotations.