be hoist with one's own petard

To be undone by one's own schemes.

Name	Pronounced	Usage
Baillie	['beili]
Vilhelm	VEEL-helm (Finnish)	Swedish, Norwegian, Danish, Finnish, Hungarian
Purnama	poor-NAH-mah	Indonesian
Ekwueme	-	Western African, Igbo
Iwan	EE-wan (Welsh), EE-vahn (Polish)	Welsh, Polish
Elma	EL-mah (German)	Dutch, German