petard

n (idm 习语) hoist with one's own petard => hoist.

pesky, peso, pessary, pessimism, pessimist, pessimistic, pessimistically, pest, pest control, pester, pesticide, pestilence, pestilent, pestle, pet, pet name, pet shop, pet subject, petal, petalled (US petaled), peter, petit bourgeois, petite, petition, petitioner, petrel, petrifaction, petrify, petro-, petrochemical, petrodollar, petroglyph, petrography, petrol, petrol bomb, petrol fumes, petrol tank, petroleum, petrologist, petrology,