underscore

• POS: Noun, Verb (usu participle), Verb (transitive)
• HYPHEN: un=der=score

CIDE DICTIONARY

underscore, v. t. 

 To draw a mark or line under; to underline.  J. Tucker.  [1913 Webster]

OXFORD DICTIONARY

underscore, v. & n.
--v.tr. = UNDERLINE v.
--n. = UNDERLINE n. 1.

THESAURUS

underscore

accent, accentuate, band, bar, belabor, blaze, blaze a trail, blemish, blotch, brand, chalk, chalk up, check, check off, cicatrize, cross-hatching, dapple, dash, define, delimit, delineation, demarcate, diagonal, discolor, dot, dotted line, dwell on, emphasize, engrave, feature, fleck, freckle, gash, give emphasis to, hachure, hairline, harp on, hatch, hatching, highlight, impress, imprint, italicize, line, lineation, make a mark, mark, mark off, mark out, mottle, nick, notch, overaccentuate, overemphasize, overstress, pencil, pepper, place emphasis on, play up, point, point up, prick, print, punch, punctuate, puncture, riddle, rub in, scar, scarify, score, scotch, scratch, seal, seam, slash, speck, speckle, splotch, spot, spotlight, stain, stamp, star, stigmatize, streak, streaking, stress, striate, striation, strip, stripe, striping, stroke, sublineation, tattoo, tick, tick off, trace, underline, underlining, underscoring, virgule

ROGET THESAURUS

underscore

Indication

VB indicate, be the sign, of, denote, betoken, argue, testify, bear the impress, of, connote, connotate, represent, stand for, typify, symbolize, put an indication, put a mark, note, mark, stamp, earmark, blaze, label, ticket, docket, dot, spot, score, dash, trace, chalk, print, imprint, impress, engrave, stereotype, make a sign, signalize, underscore, give a signal, hang out a signal, beckon, nod, wink, glance, leer, nudge, shrug, tip the wink, gesticulate, raise the finger, hold up the finger, raise the hand, hold up the hand, saw the air, suit the action to the word, wave a banner, unfurl a banner, hoist a banner, hang out a banner, wave the hand, wave a kerchief, give the cue, show one's colors, give an alarm, sound an alarm, beat the drum, sound the trumpets, raise a cry, sign, seal, attest, underline, call attention to, give notice.