underscore

[v. uhn-der-skawr, -skohr, uhn-der-skawr, -skohr; n. uhn-der-skawr, -skohr]
verb (used with object), underscored, underscoring.
1.
to mark with a line or lines underneath; underline, as for emphasis.
2.
to stress; emphasize: The recent tragedy underscores the danger of disregarding safety rules.
noun
3.
a line drawn beneath something written or printed.
4.
music for a film soundtrack; background for a film or stage production.

Origin:
1765–75; under- + score

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
underscore
 
vb
1.  to draw or score a line or mark under
2.  to stress or reinforce
 
n
3.  a line drawn 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

underscore
1771, "to draw a line under," from under + score (v.). The fig. sense of "to emphasize" is attested from 1891. Noun meaning "a line drawn below (something)" is recorded from 1901.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The fact that you do not appreciate the complexities of economics underscores
  why no one asked you to make those decisions.
On the contrary, that you seem to find it necessary to resort to such remarks
  painfully underscores your lack of them.
Globalisation underscores the need for a flexible, dynamic labour market and a
  well-educated, adaptable workforce.
The tendency of the effects of bullying to worsen when left untreated
  underscores the need for early intervention as well.
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