“Hoist with his own Petard”.

Petard_gros_1812For years my dear friend Vic Potticary would use this expression and for all that time I would pretend to know exactly what Vic was talking about.
But, I didn’t, I had visions of Terence Stamp swinging from the yardarm (my petard) in that wonderful black and white movie about the British navy, “Billy Budd”.
I was wrong. This is the Truth…
Injured by the device that you intended to use to injure others or being blown up by your very own petard.
Origin
The phrase ‘hoist with one’s own petar[d]’ is often cited as ‘hoist by one’s own petar[d]’.
The two forms mean the same, although the former is strictly a more accurate version of the original source.
A petard is, or rather was, as they have long since fallen out of use, a small engine of war used to blow breaches in gates or walls. They were originally metallic and bell-shaped but later cubical wooden boxes.
Whatever the shape, the significant feature was that they were full of gunpowder – basically what we would now call a bomb.
The device was used by the military forces of all the major European fighting nations by the 16th century to generally battlements and castle gates.
In French and English – petar or petard, and in Spanish and Italian – petardo.
The dictionary maker John Florio defined them like this in 1598:
“Petardo – a squib or petard of gun powder vsed to burst vp gates or doores with.”
Petar was part of the everyday language around that time, as in this rather colourful line from Zackary Coke in his work Logick, 1654:
“The prayers of the Saints ascending with you, will Petarr your entrances through heavens Portcullis”.
Once the word is known, ‘hoist by your own petard’ is easy to fathom. I’s nice also to have a definitive source – no less than Shakespeare, who gives the line to Hamlet, 1602:
“For tis the sport to have the enginer Hoist with his owne petar”.
derwombat

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