Definition of underline verb from the Oxford Advanced American Dictionary

     

    underline

     verb
    verb
    NAmE//ˈʌndərˌlaɪn//
     
    (also underscore)Verb Forms present simple I / you / we / they underline
     
    he / she / it underlines
     
    past simple underlined
     
    -ing form underlining
     
     
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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 preschool 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.
See the Oxford Advanced Learner's Dictionary entry: underline