The phrase "wimping out" means to back down or give up on something due to fear, pressure, or lack of confidence. Its antonyms would be words or phrases that indicate bravery, determination, and resiliency. Some antonyms of "wimping out" include standing up, stepping up, facing your fears, taking a stand, sticking it out, and soldiering on. These words convey the idea of facing challenges, pushing past obstacles, and showing courage in the face of adversity. When we choose to push harder, refuse to give up, and take control of our lives, we become stronger and more empowered.