The antonyms for "big breaks" could include "mistakes," "setbacks," or "failures." These words describe situations in which things do not go as planned, and opportunities may be lost or missed. Instead of a big break or chance for success, these words suggest a feeling of disappointment, frustration, or defeat. However, it is important to remember that setbacks and failures are a natural part of any journey towards success. It is through these experiences that we learn and grow, and eventually, we may find ourselves with even bigger and better opportunities for success in the future.