The word 莺歌燕舞 is formed by combining two two-character phrases: 莺歌, meaning "orioles sing", and 燕舞, meaning "swallows dance". These phrases are juxtaposed in a parallel structure, where each bird (莺 and 燕) is paired with an action (歌 and 舞), resulting in a four-character compound that literally depicts birds singing and dancing, typically used to convey a scene of liveliness and prosperity.