Cách sử dụng
A petard is a small explosive device that was used in olden days to blow up gates or doors. In modern English, the term is used in the phrase 'hoist with his own petard' which means someone has been trapped by their own plans. It is common to use this phrase in a situation where someone's actions have backfired on them. For example, if someone tries to prank their friend, but the friend finds out and pranks them back even worse, we could say that the first person was hoist with their own petard.