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To close or obstruct.

ob′tu·ra′tion n.
References in periodicals archive ?
It's perfectly normal so see a little carbon blacking but when it's excessive like that we know that there wasn't even enough pressure to obturate the case at all.
The Foster slugs have very shallow rifling and since these slugs obturate in shotgun bores, most of these grooves are ironed out in the process.