Definition of line verb from the Oxford Advanced Learner's Dictionary

     

    line

     verb
    verb
    BrE BrE//laɪn//
     
    ; NAmE NAmE//laɪn//
     
    Verb Forms present simple I / you / we / they line
    BrE BrE//laɪn//
     
    ; NAmE NAmE//laɪn//
     
    he / she / it lines
    BrE BrE//laɪnz//
     
    ; NAmE NAmE//laɪnz//
     
    past simple lined
    BrE BrE//laɪnd//
     
    ; NAmE NAmE//laɪnd//
     
    past participle lined
    BrE BrE//laɪnd//
     
    ; NAmE NAmE//laɪnd//
     
    -ing form lining
    BrE BrE//ˈlaɪnɪŋ//
     
    ; NAmE NAmE//ˈlaɪnɪŋ//
     
     
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    cover inside
  1. 1[often passive] line something (with something) to cover the inside of something with a layer of another material to keep it clean, make it stronger, etc. Line the pan with greaseproof paper.
  2. 2line something to form a layer on the inside of something the membranes that line the nose
  3. form rows
  4. 3[often passive] to form lines or rows along something line something Crowds of people lined the streets to watch the race. line something with something The walls were lined with books. see also lined
  5. Word Originverb sense 3 Old English līne ‘rope, series’, probably of Germanic origin, from Latin linea (fibra) ‘flax (fibre)’, from Latin linum ‘flax’, reinforced in Middle English by Old French ligne, based on Latin linea. verb senses 1 to 2 late Middle English: from obsolete line ‘flax’, with reference to the common use of linen for linings.Idioms
    line your (own)/somebody’s pockets
     
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    to get richer or make somebody richer, especially by taking unfair advantage of a situation or by being dishonest Health services are lining the drug companies’ pockets, according to the report.
    Phrasal Verbsline upline up somebodyline somethingup (with something)
See the Oxford Advanced American Dictionary entry: line