\version "2.19.49"
% \version "2.11.65"

music = \relative c' \new Voice = "music" {
  \repeat volta 2 { c4 c c c ~ }
  \alternative {{ c2 c }{
    c2\repeatTie a4( c) }} \bar "|."
}

nbsp = \markup \char ##x00A0

words = \lyricmode {
  Da da da dah __ da
  \once \override LyricText.X-offset = #-2
  \nbsp __ dum.
}

<<
  \music
  \new Lyrics \lyricsto "music" \words
>>