to "hoist by one's own petard" means you
www.urbandictionary.com
He has no one to blame but himself; he was hoisted by his
en.wiktionary.org
Hoist by your own petard - the meaning and origin of
www.phrases.org.uk
"Hoist by my own petard"--everybody says it, and so do I. But neither
www.straightdope.com
A petard (see under "peter out" for the etymology) was an explosive
alt-usage-english.org
However, our conversations have led us to believe that
www.alphadictionary.com
Mar 19, 2007 ... freshmeat maintains the Web's largest
freshmeat.net
Definition of petard from the Merriam-Webster Online Dictionary with audio
www.merriam-webster.com
The story behind the Weird Word 'petard'. ... A petard was a bell-shaped
www.worldwidewords.org