👉 The term "silverwing" is a colloquial term used in literature, music and other forms of media to refer to a character or object that appears briefly but has an important effect on the plot. The term was originally used by John Milton (c. 1628-1603) in his poem "Paradise Lost". He refers to the silverwing as "the most precious bird" and uses it as a metaphor for the poet's own love of beauty