Bore up under is a phrase that means to endure or persevere through a difficult situation. Its antonyms are words that convey the opposite idea, including give in, surrender, succumb, yield, and quit. These terms suggest weakness or a lack of resilience in the face of adversity. In contrast to bore up under, they imply that the individual is unable to handle pressure and may crumble under the weight of challenges. By understanding the antonyms of bore up under, one can better appreciate the strength and perseverance required to face difficult situations and overcome obstacles, rather than giving up in defeat.