Definition of underline in English:

underline

Syllabification: un·der·line
Pronunciation: /ˌəndərˈlīn
 
/

verb

[with object]
1Draw a line under (a word or phrase) to give emphasis or indicate special type.
More example sentences
  • Copy the articles or excerpts by hand underlining those words and phrases that you think are significant in the creation of mood and/or atmosphere.
  • Please indicate italics by underlining and indicate boldface by drawing a wavy line beneath the affected characters.
  • For some that meant moving from writing each idea on a separate line to using headers and underlining vocabulary words.
Synonyms
underscore, mark, pick out, emphasize, highlight
1.1Emphasize (something): the improvement in retail sales was underlined by these figures
More example sentences
  • Nevertheless, the sale seemed to underline their minor status.
  • The television figures underline the sustained popularity of the annual broadcasts from the festival and this year's programme attracted over 56 per cent of the Irish audience at its peak.
  • These figures underline the fact that we are in the great boom in advertising for years, much greater than anything seen in 1999-2000.
Synonyms

noun

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1A line drawn under a word or phrase, especially for emphasis.
More example sentences
  • That last sentence has a green underline on my word processor, and when I right click to see what grammatical snafu I've made, it says ‘Wordiness.’
  • Take this familiar experience: spell a word wrongly in your word processor and you see a wavy red underline appear under the word.
  • I don't think the problem is the color, the problem is the highlighting as opposed to an underline.
2The line of the lower part of an animal’s body.

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Word of the day grammarian
Pronunciation: grəˈmɛːrɪən
noun
a person who studies and writes about grammar