[UNDER-1 4 a.] trans. To draw a score or line beneath; to underline.

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1771.  Luckombe, Hist. Print., 249. [They] either underscore the word, or make some other token, which may inform the Compositor of the Author’s intention.

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1838.  Lytton, Alice, XI. v. The notice to Howard, with the name of Vargrave underscored, was still on the panels.

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1874.  Blackie, Self-Cult., 35. Underscore these distinctly with pen or pencil.

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  fig.  1891.  W. S. Gilbert, Rosencrantz & G., III. He who doth so mark, label, and underscore his antic speeches.

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  Hence Underscored ppl. a., -scoring vbl. sb.

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1847.  Kinglake, Eöthen, viii. 101, note. The underscoring of the word ‘ancient,’ is by the writer of the letter.

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1865.  Sat. Rev., 4 March, 243/1. The underscored passages in the favourite sermon.

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1871.  Lowell, Study Wind. (1886), 165. An emphasis out of place … reminds one of the underscorings in young ladies’ letters.

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