The phrase "goes by book" typically means to strictly follow rules, regulations or guidelines. Antonyms for this phrase include "goes with the flow", which means to be flexible and adaptable to changing situations, "flies by the seat of their pants", implying spontaneity and improvisation, or "bends the rules", suggesting a willingness to make exceptions or take shortcuts. Other antonyms might include "takes risks" or "thinks outside the box", indicating a willingness to break or bend established conventions. In contrast to "going by the book", these opposing phrases imply a willingness to take chances, challenge the status quo, or explore new and uncharted territory.