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English definition of “eagle eye”

eagle eye

noun [C usually singular]    
If someone has an eagle eye, they notice everything, even very small details: We sat down and started the exam under the eagle eye of the teacher.PerceptiveUsing the eyesIntelligence eagle-eyed     /ˌiː.ɡl̩ˈaɪd/ adjective My eagle-eyed mother noticed that some cakes had gone missing.PerceptiveUsing the eyesIntelligence
(Definition of eagle eye noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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