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- (idiomatic) A young person who is ugly, but who is expected to become beautiful as they mature.
- 2019 December 4, Andy Coward, “Derby's crowning achievement”, in Rail, page 57:
- The ugly duckling has become a very fine swan, and Rachel Sprigg and her team have worked hard to ensure that Derby is a worthy winner of that coveted National Rail Award. They can be proud of their achievements.
one who is ugly, but who is expected to become beautiful as they mature