Removing specific highlight group

Want to remove a user-defined highlight group by its name.

Now
:highlight clear
"Removes all highlighting for groups added by the user!"
and
:highlight clear {group-name}
"Disable the highlighting for one highlight group."
But what I want is to completely remove a specific
highlight by name freeing up
the associated storage.
I assume if I create 1000 highlight definitions, it uses
memory, so I'd like to be able to free up that memory
after the highlights are no longer needed.

Thanks

Richard
--
Quis custodiet ipsos custodes

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