) Also called Flying Dustbin. a British spigot mortar of World War II that fired a 40-pound (18 kg) finned bomb, designed to destroy pillboxes and other concrete obstacles.
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with one's own petard, hurt, ruined, or destroyed by the very device or plot one had intended for another.:10
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| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| a chattering or flighty, light-headed person. |
"For tis the sport to haue the enginer Hoist with his owne petar" ("Hamlet" III.iv.207).See hoist.