Say I've redefined some command
\renewcommand{\oldcommand}{\newcommand}
If I want to use this new command everywhere in my LaTex document except for once or twice, where I need to make use of the old command, is there a way to use the old command, without getting rid of my \renecommand statement?
This is a hypothetical question, so I don't have a concrete example of a document where I would need an answer to this, but I am curious.
Thanks a lot.

\let\oldmacro\macro\renewcommand\macro{whatever}When you need the original meaning, use\oldmacro. – egreg Apr 01 '17 at 23:08