Definition of line of sight noun from the Oxford Advanced American Dictionary

 

line of sight

 noun
noun
 
(also ˌline of ˈvision, ˈsight line)
 
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an imaginary line that goes from someone's eye to something that they are looking at There was a column directly in my line of sight, so I could only see half the stage.
See the Oxford Advanced Learner's Dictionary entry: line of sight