hoist by one's own petard

Trap snares its setter

To be hoist by one's own petard is to be harmed by a scheme you intended for someone else—caught in your own trap.

A petard was a small explosive device used to breach gates; being hoisted meant being blown up by your own bomb.

The phrase now applies to any backfiring plan: The smear campaign hoist him by his own petard when voters turned against his tactics.

Related

blow up in your face · taste of one's own medicine · grenade · unintended consequences · miscalculation · explosive device · idiom · figure of speech · bomb · boomerang effect · metaphorical language · self-sabotage · own goal · cutting off one's nose to spite one's face · Elizabethan language · irony · fuse · detonation

Opposites
source of downfall

hoist by one's own petardblindsided

Surprised by unforeseen impact

collateral damage · caught in the crossfire · stabbed in the back · ambushed · innocent bystander

outcome of one's schemes

hoist by one's own petardget away with it

have the last laugh · got away with it · outfox · outsmart · pull it off

justice/irony mechanism

hoist by one's own petardno good deed goes unpunished

Benevolence often brings misfortune

Family

hoist, hoists, hoisted, hoisting, owned, owner, owners, petard, petards

Familiarity
Top 500,000
Profile
Used worldwide · Timeless · Negative · Everyday, not technical · Rated G