ugly duckling - definition and synonyms

noun [countable] 

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singularugly duckling
pluralugly ducklings
  1. someone who people think will never be attractive or successful but who becomes very attractive or successful as they get older
     Synonyms and related words
Word story
From a children’s story by Hans Christian Andersen, in which a young swan is unhappy because it thinks it is a duck but doesn’t look like the other ducks. However, it later grows up and realizes it is a beautiful swan.