Brace up is a phrase that is often used to encourage or motivate someone to be strong, courageous, and resilient in the face of challenges. While there are no direct antonyms for brace up, there are several words that convey the opposite meaning. The antonyms for brace up may include, demotivate, dishearten, discourage, weaken, and deflate. These words depict a state of weakness or vulnerability, which is the opposite of being braced up. It is essential to use positive and encouraging words to uplift someone and help them build confidence and resilience. Thus, it is important to use the opposite of the antonyms mentioned above to inspire and strengthen someone.