1. a small exposive used to blow a hole through a door/wall
2. something figuratively explosive
► uses
Uses:
Truewit: [speaking through the keyhole] Sir Amorous, there's no standing out: He has made a petard of an old brass pot, to force your door. Think upon some satisfaction, or terms to offer him.
Ben Jonson. Epicoene (1609)
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For 'tis the sport to have the enginer
Hoist with his own petard: and 't shall go hard
But I will delve one yard below their mines
And blow them at the moon
William Shakespeare. Hamlet
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Guilleminot's fatal heedlessness when he had neither petard nor powder sacks