A "weak structure" refers to a framework or system that lacks stability and support, making it prone to failure or collapse. This can apply to various contexts, such as buildings, organizations, or even arguments. In construction, a weak structure may result from poor materials or design, leading to safety hazards. In the context of arguments, a weak structure occurs when the reasoning is flawed or unsupported by evidence. This can make the argument less convincing and easier to challenge. Overall, weak structures can lead to significant issues, whether in physical constructions or logical reasoning.