The phrase suggests something fixed, permanent, or undeniably present, despite its seemingly impossible or fantastical nature. It evokes an image of something securely fastened in a high and visible location, indicating prominence and inescapability. As an example, one could use it to describe an idea or principle so deeply ingrained in a culture that it is considered unquestionable.
The significance of this figurative expression lies in its capacity to convey a sense of immutability and widespread acceptance. Its deployment often highlights concepts that are considered fundamental, essential, or resistant to change. Historically, such terms have been used to reinforce prevailing beliefs or underscore the perceived stability of societal norms. They can also serve as a rhetorical device to emphasize the unwavering nature of commitment or the enduring quality of a particular phenomenon.