"Rose in arms" is an expression that signifies a feeling of joy, happiness, and triumph. However, sometimes we may need to convey the opposite meaning. In this case, we could use antonyms such as "defeated," "sad," or "disheartened." Alternatively, we could also use contrasting phrases such as "down in spirits," "crestfallen," or "gnashing of teeth." Antonyms help us to convey contrasting emotions, and can be useful when we want to emphasize a different point of view or mood. By using clear and concise language, we can communicate effectively and ensure that our message is understood.