The Vietnamese word "gùn" (also written as "gút") refers to small lumps or irregularities that can appear on fabric, particularly silk. It's a term often used to describe the texture of cloth when it has some imperfections or bumps.
In summary, "gùn" is a useful word in Vietnamese to describe the quality of fabric, particularly when it is not smooth and has small lumps. It is also versatile enough to be applied in broader contexts.