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

     

    underline

     verb
    verb
    BrE BrE//ˌʌndəˈlaɪn//
     
    ; NAmE NAmE//ˌʌndərˈlaɪn//
     
    (also underscore especially in North American English)Verb Forms present simple I / you / we / they underline
    BrE BrE//ˌʌndəˈlaɪn//
     
    ; NAmE NAmE//ˌʌndərˈlaɪn//
     
    he / she / it underlines
    BrE BrE//ˌʌndəˈlaɪnz//
     
    ; NAmE NAmE//ˌʌndərˈlaɪnz//
     
    past simple underlined
    BrE BrE//ˌʌndəˈlaɪnd//
     
    ; NAmE NAmE//ˌʌndərˈlaɪnd//
     
    past participle underlined
    BrE BrE//ˌʌndəˈlaɪnd//
     
    ; NAmE NAmE//ˌʌndərˈlaɪnd//
     
    -ing form underlining
    BrE BrE//ˌʌndəˈlaɪnɪŋ//
     
    ; NAmE NAmE//ˌʌndərˈlaɪnɪŋ//
     
     
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  1. 1underline something to draw a line under a word, sentence, etc. The names of the winners are underlined in red.
  2. 2to emphasize or show that something is important or true underline something The report underlines the importance of pre-school education. underline how, what, etc… Her question underlined how little she understood him. underline that… The report underlined that the project enjoyed considerable support in both countries. it is underlined that… It should be underlined that these are only preliminary findings.
  3. Extra examples The word ‘not’ was heavily underlined. These statistics underline an important point. This disaster merely underlines the need for a consistent foreign policy. This disaster merely underlines the need for caution. a move intended to underline US concern over the issue Her question only underlined how little she understood him. The prime minister underlined the government’s commitment to tackling this issue. The victory underlined the extent to which Prussia had become a major power.
See the Oxford Advanced American Dictionary entry: underline