👉 Thickening is a process in which cells or tissues become more densely packed together, often due to changes in their environment. This can occur in different ways, such as through changes in cell size, shape, or structure, or through changes in the chemical composition of cells. The term "thickens" refers to the increased density and volume of an object or substance, which may be caused by a variety of factors such as physical deformation, mechanical stress, or chemical reactions.