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English definition of “underline”

underline

verb [T]     /ˌʌn.dəˈlaɪn/ US  /-dɚ-/ (also underscore)
B1 to draw a line under a word, especially in order to show its importance: All the technical words have been underlined in red.Stressing and emphasizing B2 to emphasize: She put the figures up on the board to underline the seriousness of the situation. To underline their disgust, the crowd started throwing bottles at the stage.Stressing and emphasizing
(Definition of underline verb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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