Definition from Wiktionary, the free dictionary
Verb sense of "to seal the breach of a gun"?
I have seen obdurate used as a verb meaning "to seal the breach of a gun." I cannot give a citation, but perhaps someone else has seen this usage. -- 220.127.116.11
- The OED shows an obsolete verb sense meaning "to harden." So what you saw might have been a variation on that sense. -- WikiPedant 16:15, 19 December 2007 (UTC)