The phrase “birds of a feather” comes from the proverb “birds of a feather flock together,” which means that people with similar interests, behaviors, or characteristics tend to associate with one another.
In Billie Eilish’s song “Bellyache,” the lyrics reflect themes of guilt and the consequences of one’s actions. While the song doesn’t explicitly reference the phrase “birds of a feather,” its exploration of morality and the internal struggle of the protagonist suggests a deeper connection to the idea of like-minded individuals and the choices they make.
In the context of the song, the phrase can be interpreted to highlight how individuals who share similar feelings or experiences—such as guilt, regret, or the thrill of wrongdoing—might find themselves drawn together, reinforcing the emotional weight of their actions. This underlying notion can add depth to the song’s narrative about the conflict between desire and morality.
If you’d like a more detailed analysis of specific lyrics or themes in the song, feel free to ask!