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English definition of “line”

line

noun [C] (DIVISION)    /laɪn/
C2 a long, thin and sometimes imaginary mark that forms the edge, border, or limit of something: That ball was definitely in! It was nowhere near the line! The police couldn't arrest him because he'd fled across the state line. For many television viewers the dividing line between fact and fiction is becoming increasingly blurred.Edges and extremities of objectsSurfaces of objects
(Definition of line noun (DIVISION) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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