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Phrase(s): lie fallow
1. Lit. [for farmland] to exist unplanted for a period of time. • The fields lay fallow under the burning sun. It had been too wet to plant last spring. 2. Fig. [for a skill and talent] to remain unused and neglected. • You should not let your talent lie fallow. Practice the piano before you forget how to play it. • His writing had lain fallow for so long that he could hardly write a proper sentence.
McGrawhill's American Idioms And Phrasal Verbs