underline

[v. uhn-der-lahyn, uhn-der-lahyn; n. uhn-der-lahyn]
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:
1715–25; under- + line1

underlining, underlineation [uhn-der-lin-ee-ey-shuhn] , noun
underliner, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
underline
 
vb
1.  to put a line under
2.  to state forcibly; emphasize or reinforce
 
n
3.  a line underneath, esp under written matter

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

underline
1721, from under + line (v.). Cf. Du. onderlijnen. The noun is attested from 1888.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
And how the folk who have commented here underline that.
Your statements underline my conviction that you are utterly ignorant of the
  evidence.
Underline introduction and ask students what it means.
Then have them underline the words that helped them form the picture.
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