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Phrase(s): Fields have eyes, and woods have ears.
Prov. Even though you are outside in an apparently empty landscape, someone may be eavesdropping on you. • Jill: You said you had a secret. Tell me. Jane: Not here. Jill: But there’s nobody else in the park. Jane: Fields have eyes, and woods have ears.
McGrawhill's American Idioms And Phrasal Verbs