the idea of a nose growing longer when someone lies is a popular fictional concept, most commonly associated with the character Pinocchio.
In the story of Pinocchio, the wooden puppet's nose grows longer every time he tells a lie. The concept is used to illustrate the importance of honesty and the consequences of dishonesty. The length of the nose in the story is a symbolic representation of the lies told.
In reality, there is no scientific basis or evidence to suggest that lying would cause a person's nose to physically grow longer. It remains a fictional and allegorical concept used in storytelling rather than a real-world phenomenon.