Cách sử dụng
A trapdoor is a type of door that is hinged at the bottom and opens upwards, like a lid. It is often used in floors or ceilings to provide access to a cellar or attic, or to hide something. For example, in movies, you may see characters escaping through a trapdoor in the floor or hiding items in a trapdoor in the ceiling. The word "trapdoor" can also be used metaphorically to refer to something that is hidden or secretive.