be hoist with one's own petard

To be undone by one's own schemes.

Name	Pronounced	Usage
Eliakim	-	Biblical
Alessia	-	Italian
Rosita	ro-SEE-tah	Spanish
Mahon	-	Irish
Matteo	maht-TE-o	Italian
Iwan	EE-wan (Welsh), EE-vahn (Polish)	Welsh, Polish