This question already has an answer here:
How can I tell Latex that I want my paragraph with n less lines? I saw a question some days ago, but after twenty minutes of heavy searching (I think), I found nothing.
There is a “penalty” or something like that which asks Latex to try to put the text in less lines. Something like
\reducelines=-1 asks Latex (TeX) to reduce the number of lines by one.
I know this is a duplicate, but I can't find the “original” question.