I thought it was short for "Super User Do"? 🤔
No, it's not. It's from su command "switch user". Also check the man page that says "sudo, sudoedit — execute a command as another user".
I've heard people say that, but it's pretty well established that sudo is derived from the old UNIX su command, which is definitely 'switch user'. It just happens that both have the root user as the default user to when a specific user isn't specified and that's the common case, but there's nothing that prevents you from using it to switch to any user (and by default, the root user can use sudo to do so without needing a password).
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