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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: How do I get rid of a face defined with defface?
Date: Sat, 20 Jul 2019 17:10:41 +0300
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> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Date: Sat, 20 Jul 2019 10:05:06 -0400
> 
> > How to do what?
> 
> I think he wants to *undefine* a face in the running session.

You can't, AFAIK.