Silence of a voice - how?

[Schweikert, Martin {POYD~Kaiseraugst}]

Hi!

I have a piece of choir music. The soprano and the alto have nearly the same 
text - in only one or two bars they differ.

So it is not possible, to have only one lyrics context.

I would like to have a soprano lyrics context with all the words that the 
soprano voice has to sing. I would like to have an alto lyrics context also, 
but with a large silence at the beginning, then (at the n-th bar) the words 
which are different for the alto voice in this bar.

Now my question: What is the analogon for the \skip statement? What must I put 
to the beginning of the alto voice?

I tried 

""2.*48

but this does not work.

Best Regards / Mit freundlichem Gruss
Martin Schweikert
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