Petard

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Petard
/pɛˈtɑːd/ (n.)
From French: a small bomb comprising a box filled with powder, used to blast down a door or to make a hole in a wall. A squib; a firecracker. If it goes off it will frighten the bejesus out of the financial analyst community and may cause a bank run.

Hence, to be hoist by one’s own ~: to blow oneself up. Something that financial institutions are periodically prone.

See also

• Lucky
• The first rule of Systemic Solvency Club