The characters combine to create a powerful metaphor: The elegant appearance (秀色) is worthy of being dined upon (可餐). The beauty is so profound it transcends sight and becomes an almost tangible, nourishing experience.
This idiom reflects the deep appreciation for aesthetics in traditional Chinese culture, where poetry and art often blend sensory experiences. Food is central to Chinese culture, so comparing something to a delicious meal is one of the highest forms of praise. It elevates beauty from something merely seen to something that can be savored and which provides spiritual nourishment. A close Western equivalent is “a feast for the eyes.” However, 秀色可餐 carries a more literary and refined weight. Another similar English phrase, “good enough to eat,” can sometimes have more direct, physical, or even slightly possessive connotations. In contrast, 秀色可餐 is almost always used to express pure, detached aesthetic appreciation. The focus is on the beauty itself and its profound effect on the observer, rather than any desire to consume or possess.
This is a formal and literary idiom. While understood by most native speakers, it's not typically used in very casual, everyday conversation.