Aligning linebreaks in long `\item{}` inside description environment

Question

Here is MWE.

\documentclass[a4paper,10pt]{article}
\begin{document}
\begin{description}
    \item{Foo\ Bar \ Baz }
        : Foo, Bar and Baz are friends.
    \item a, b, c
\end{description}
\end{document}

It produces this:

Linebreaks are working fine but Foo, Bar and Baz are not aligning to the left. Is there a way to fix this? I rather redefine the description environment rather than change the text inside item{} everywhere in my current doc which has many descriptions.

Answer 1

Two observations. First, in LaTeX's description environment, the argument of \item should be encased in square brackets, not curly braces. Second, to place several items in the argument of \item [pun intended] in a vertical stack, you could use a tabular environment. The following example code provides short-hand macro called \mystack that simplifies the creation of a stack of items.

\documentclass{article}
\newcommand\mystack[1]{\begin{tabular}[t]{@{}l@{}} #1 \end{tabular}}
\begin{document}
\begin{description}
    \item[\mystack{Foo \\ Bar \\ Baz}]: Foo, Bar, and Baz are friends.
    \item[a, b, c] \dots
\end{description}
\end{document}