\indvdldef{A}{one's name}[\maleline]
\indvdldef{B}{one's loooong name}[\maleline]
\sblngdef{ABbro}{A,B}
%
{
\def\arraystretch{1.5}
\begin{tabular}{l}
\fbox{\usebox{\A}}\\
\fbox{\usebox{\B}}\\
\\
\fbox{\usebox{\ABbro}}
\end{tabular}
}