hoist by one's own petard in French
hoist by one's own petard in French
l'arroseur arrosé
(idiomatic) Hurt or destroyed by one's own plot or device intended for another; "blown up by one's own bomb".
tel est pris qui croyait prendre
(idiomatic) Hurt or destroyed by one's own plot or device intended for another; "blown up by one's own bomb".