petard /pe-tär or -tärdˈ/

1. A case containing an explosive, used for blowing in doors, etc (Shakespeare petarˈ)
2. A moving firework

hoist with one's own petard see under hoist

• sureness
• surenesses
• surer
• sures
• surest
• sure thing
• sure things
• swatchbooks
• swatches
• swath
• swathe
• swathed
• swathes
• swathier
• swathiest
• swathing
• swathing-clothes
• swathling-clouts
• swaths
• swathy
• swats
• swatted
• swatter
• swattered
• swattering