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line of sight

Definition

the direction in which a person must look in order to see a particular object: The cannon can be linked to the line of sight of the gunner so that it points in the same direction that he is looking in.Using the eyesEyesight, glasses and lensesThe eye and surrounding areaPerceptive
(Definition of line of sight from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)