'Underscore' definitions:

Definition of 'underscore'

From: WordNet
noun
A line drawn underneath (especially under written matter) [syn: underscore, underline]
verb
Give extra weight to (a communication); "Her gesture emphasized her words" [syn: underscore, underline, emphasize, emphasise]
verb
Draw a line or lines underneath to call attention to [syn: underline, underscore]

Definition of 'Underscore'

From: GCIDE
  • Underscore \Un`der*score"\, v. t. To draw a mark or line under; to underline. --J. Tucker. [1913 Webster]