underties in stanzas

[Henning Hraban Ramm]

Hi fellow ponders,

I finally searched for the sign for visibly combining syllables (see
http://lilypond.org/doc/v2.14/Documentation/notation/common-notation-for-vocal-music#multiple-syllables-to-one-note),
and "~" works great in lyrics in that the undertie gets kerned below
the syllables it combines.

I'd like to achieve the same in further verses, printed below (i.e. in
\markup). The raw unicode symbol U+203F (‿) is too wide, I didn't find
a similar but narrower glyph.

Can I use the mechanism from lyrics  within \markup? Or do you know a
better solution?

Greetlings, Hraban