underline
1. [ verb ] give extra weight to (a communication)
Synonyms: underscore emphasize emphasise
Examples:

"Her gesture emphasized her words"

Related terms: stress emphasizing
2. [ verb ] draw a line or lines underneath to call attention to
Synonyms: underscore
Related terms: mark underscore
3. [ noun ] a line drawn underneath (especially under written matter)
Synonyms: underscore
Related terms: stroke
Similar spelling:   underlie
  underling
  undermine
  underpin
  unadorned
  underdone
  undertone
  under_fire
  underlying
  underneath
  underprice
  underwrite
  undervalue
  underwriter
  undertaking
  underseller
  underhanded
  undermanned
  underrating
  underlay
  underfed
  underfur
  underage
  undersea
  underlayment
  Underhill
  underpart
  underwing
  underhand
  undergird
  underhung
  underrate
  underwear
  undertide
  underseal
  undersell
  underfelt
  Underdown
  underside
  undersign
  undersize
  Underdahl
  undersoil
  underbred
  undertake
  underived
  undercurrent
  undersurface
  undergarment
  undoer
  untier
  underpants
  undertaker
  underbelly
  underspent
  undercover
  underspend
  underskirt
  undersized
  undershrub
  underworld
  underdress
  undershirt
  undersexed
  under_arms
  underwater
  underframe
  undersealed
  underscore
  underquote
  undergo
  understate
  under_wraps
  underexpose
  underweight