This is just for DLS customers I see.
... the ISPs are hoist on their own petard (what's a petard, BTW?)...
... hoist on their own petard (what's a petard, BTW?).
1.1 A small engine of war used to blow in a door or gate, or to make a breach in a wall, etc.; originally of metal and bell-shaped, later a cubical wooden box, charged with powder, and fired by a fuse. (Now Hist.)
1604 Shakes. Ham. iii. iv. 207 (2nd Quarto) For tis the sport to haue the enginer Hoist with his owne petar.
1598 Florio, Petardo, a squib or petard of gun powder vsed to burst vp gates or doores with.
It actually predates Hamlet, Shakespeare invented the saying about hoisting, not the word, e.g.
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