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[v. uhn-der-lahyn, uhn-der-lahyn; n. uhn-der-lahyn] /v. ˈʌn dərˌlaɪn, ˌʌn dərˈlaɪn; n. ˈʌn dərˌlaɪn/
verb (used with object), underlined, underlining.
1.
to mark with a line or lines underneath; underscore.
2.
to indicate the importance of; emphasize, as by stressing or italicizing.
noun
3.
Printing. a caption under an illustration.
4.
a line drawn under something; an underscore.
Origin
1715-1725
1715-25; under- + line1
Related forms
underlining, underlineation
[uhn-der-lin-ee-ey-shuh n] /ˌʌn dərˌlɪn iˈeɪ ʃən/ (Show IPA),
noun
underliner, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for underliner

underline

verb (transitive) (ˌʌndəˈlaɪn)
1.
to put a line under
2.
to state forcibly; emphasize or reinforce
noun (ˈʌndəˌlaɪn)
3.
a line underneath, esp under written matter
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for underliner

underline

v.

1721, from under + line (v.). Cf. Dutch onderlijnen. Related: Underlined; underlining. The noun is attested from 1888.

Online Etymology Dictionary, © 2010 Douglas Harper
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