[Tex/LaTex] How to reduce line spacing of the footnote

Question

I want to reduce the line spacing of the footnotes to be less than single spacing.

I am using the following to start the document:

\documentclass[12pt,openbib]{article}
\usepackage[singlespacing]{setspace}
\usepackage[flushmargin,multiple]{footmisc}

\begin{document}

What should I add to reduce the line spacing of the footnotes?

Answer 1

Just because you can do something, there isn't the need to do it. I cannot advice anybody to do the following. Please, please, don't. The word ugly alone cannot describe the result.

\documentclass[12pt,openbib]{article}
\usepackage[singlespacing]{setspace}
\usepackage[flushmargin,multiple]{footmisc}
\usepackage{blindtext}
\makeatletter
\def\FN@baselinestretch{.6}
\makeatother
\begin{document}
\blindtext\footnote{\blindtext}
\end{document}