Definition
A "smudge" is a blurred or smeared mark made by rubbing something, often a soft or wet substance. It's like when you accidentally rub your finger across freshly applied makeup or when ink smears on a page. Smudges are generally messy and unintentional. They differ from intentional marks like drawings or paintings. Think of it as an unwanted blurring of a line or shape. It often makes something look less neat and tidy.