"Gotten cracking" is a phrase often used to describe someone who has started working on a task with great enthusiasm and energy. The word "cracking" suggests a sense of urgency and speed. Antonyms for this phrase could include "procrastinating" or "lollygagging," which convey a sense of delay, laziness, or lack of motivation. Alternatively, antonyms could include "cautious," "deliberate," or "methodical," which suggest a slower, more careful approach to a task. In any case, the antonyms for "gotten cracking" would suggest a different way of approaching a task or project, either with less energy, more caution, or a greater emphasis on planning and process.