(historical)a small bomb made of a metal or wooden box filled with powder, used to blast down a door or to make a hole in a wall (史)(由金属或木头盒子装上炸药制成的用于炸门或在墙上炸洞的)攻城炸药箱 ■a kind of firework that explodes with a sharp report 爆竹,炮仗
常用词组 hoist with (或 by) one's own petard
have one's plans to cause trouble for others backfire on one. (see hoist) 搬起石头砸自己的脚;害人反害己
语源
mid 16th cent.: from French pétard, from péter 'break wind'