Underscore :  (noun)

1: a line drawn underneath (especially under written matter) [syn: underline]
Underscore : (verb)
1: give extra weight to (a communication); "Her gesture emphasized her words" [syn: underline, emphasize, emphasise]
2: draw a line or lines underneath to call attention to [syn: underline]

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,