old field
definitions
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An area of land that was previously used for farming but has been left uncultivated, often undergoing ecological succession with the growth of wild plants.fr: Champ en friche
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A subject, area of study, or professional domain that is no longer current, active, or widely researched.fr: Domaine obsolète
examples
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The old field was quickly reclaimed by thickets and wildflowers.
Le vieux champ a été rapidement reconquis par des broussailles et des fleurs sauvages.
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He realized that his research was focused on an old field of science.
Il a réalisé que sa recherche se concentrait sur un vieux domaine scientifique.