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underscore

[v. uhn-der-skawr, -skohr, uhn-der-skawr, -skohr; n. uhn-der-skawr, -skohr] /v. ˈʌn dərˌskɔr, -ˌskoʊr, ˌʌn dərˈskɔr, -ˈskoʊr; n. ˈʌn dərˌskɔr, -ˌskoʊr/
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
1765-1775
1765-75; under- + score
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for under score

underscore

verb (transitive) (ˌʌndəˈskɔː)
1.
to draw or score a line or mark under
2.
to stress or reinforce
noun (ˈʌndəˌskɔː)
3.
a line drawn 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 under score

underscore

v.

1771, "to draw a line under," from under + score (v.). The figurative 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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