underscore

UK: /ˌʌndə^rˈskɔː^r/

US: /ˈʌndɚˌskɔr/

US: (v. un′dər skôr′, -skōr′, un′dər skôr′, -skōr′; n. un′dər skôr′, -skōr′)

Inflections of 'underscore' (v): (⇒ conjugate)

underscores

v 3rd person singular

underscoring

v pres p

underscored

v past

underscored

v past p

WordReference Random House Learner's Dictionary of American English © 2025

un•der•score /ˈʌndɚˌskɔr/   v., -scored, -scor•ing, n. 
v. [~ + object]

1. underline (def. 1).
2. to stress;
   emphasize;
   consider as important:
   He underscored the issue again and again.
3. Show Business to provide music or a musical soundtrack for (a film).

n. [countable]

4. a line drawn beneath something written or printed.
5. Music and Dance, Show Business music for a film soundtrack.

WordReference Random House Unabridged Dictionary of American English © 2025

un•der•score  (v. un′dər skôr′, -skōr′, un′dər skôr′, -skōr′;n. un′dər skôr′, -skōr′), v., -scored, -scor•ing, n. 
v.t. 

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.

n. 

3. a line drawn beneath something written or printed.
4. Music and Dance, Show Business, Music and Dance music for a film soundtrack;
   background for a film or stage production.

• under- + score 1765–75

Collins Concise English Dictionary © HarperCollins Publishers::

underscore verb / ˌʌndəˈskɔː/(transitive)

1. to draw or score a line or mark under
2. to stress or reinforce