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English definition of “line”

line

verb [T] (FORM ROW)    /laɪn/
C2 to form a row along the side of something: Thousands of people lined the streets to watch the presidential procession pass by. Police lined the route of the demonstration. country lanes lined with treesSitting and standingParts of geometrical shapes
(Definition of line verb (FORM ROW) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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