Chris ABRAHAM on Nostr: The phrase "hoisted on your own petard" means to be harmed or defeated by something ...

The phrase "hoisted on your own petard" means to be harmed or defeated by something that you intended to use to harm or defeat others. The word "petard" refers to a small bomb used for breaching gates or walls when besieging a fortress. So, being "hoisted on your own petard" metaphorically describes a situation where someone's own plan or actions backfire on them, causing their own downfall or harm.