un·der·score

[v. uhn-der-skawr, -skohr, uhn-der-skawr, -skohr; n. uhn-der-skawr, -skohr] verb, un·der·scored, un·der·scor·ing, noun
verb (used with object)
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

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
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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FOLDOC
Computing Dictionary

underscore definition

character
_, ASCII 95.
Common names: ITU-T: underline; underscore; underbar; under. Rare: score; backarrow; skid; INTERCAL: flatworm.
See also left arrow.
(1995-03-06)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Example sentences
Odd as this may sound, it all attests to the resiliency of virtual private
  servers rather than underscore any fundamental flaws.
These stories underscore how far and deep the science of chemistry reaches into
  our modern life.
The findings underscore doctors' recommendations that people take multivitamins.
The garden's orchids, bromeliads, palm and guava trees underscore the tropical
  locale.
Related Words
underline
italicize
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