IdiomDaily LifeEnglish

diamond in the rough

Meaning: An unpolished or unsophisticated person that has potential.

Example: “The new recruit is a diamond in the rough; with training, she'll be a star.”

Origin: An uncut diamond looks like a dull pebble until it is cut and polished. The comparison for a person of good character but rough manners is recorded from the 17th century, as "rough diamond"; the American "diamond in the rough" is later.

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