Cfrgtkky

I would like to have two lines for long description names in the description environment. The only help I could find is here. Where they have the following code.

begin{description}

   % won't work

   item[first line\second line]

   % won't work

   item[first linenewline second line]

   % will work

   item[{parbox[t]{3cm}{first line\second line}}]

end{description}

But this doesn't look nice, I have a long paragraph on the item and the second line of the paragraph starts below the second line of the item label.

For single-line item data, use stackunder{}{}. For multi-line item data, use smash{stackunder{}{}}.

Also shown is the use of smash{Longunderstack{...\...\...}} in the event the label gets to be longer than 2 lines.

documentclass{article}

usepackage[usestackEOL]{stackengine}

usepackage{lipsum}

begin{document}

renewcommandstackalignment{r}% RIGHT ALIGNED STACKS

renewcommandstacktype{L}% MAKE STACKS OBEY FIXED BASELINESKIP

strutlongstacks{T}% TO GET PROPER SPACING FOR SINGLE-LINE ITEMS

begin{itemize}

   item[stackunder{first line}{second line}] blah blah

   item[smash{stackunder{first line}{second line}}] lipsum[4]

   item[smash{Longunderstack{first\second\third}}] lipsum[3]

end{itemize}

end{document}

You could add bfseries before the stack, if you wanted it in boldface.

As Bernard notes, the title bleeds into the left margin, which is a standard behavior for itemize. The way to alleviate that is to select leftmargin that allows for the widest label:

documentclass{article}

usepackage[pass,showframe]{geometry}

usepackage[usestackEOL]{stackengine}

usepackage{lipsum,enumitem}

begin{document}

renewcommandstackalignment{r}% RIGHT ALIGNED STACKS

renewcommandstacktype{L}% MAKE STACKS OBEY FIXED BASELINESKIP

strutlongstacks{T}% TO GET PROPER SPACING FOR SINGLE-LINE ITEMS

begin{itemize}[leftmargin=53pt]

   item[stackunder{first line}{second line}] blah blah

   item[smash{stackunder{first line}{second line}}] lipsum[4]

   item[smash{Longunderstack{first\second\third}}] lipsum[3]

end{itemize}

end{document}