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English definition of “underline”

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underline

verb [T] uk   /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.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.
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(Definition of underline from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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