What is Namakura in Japanese Katana terminology?

"Namakura" (なまくら) refers to a sword that has a dull edge. This term is used to describe a sword that has lost its sharpness, often due to lack of proper maintenance or excessive use. A Namakura is not ideal for combat situations as it may not perform effectively when required. It is crucial for a sword to be regularly maintained, which includes sharpening, to ensure it retains its cutting ability and overall functionality. This highlights the importance of proper care and maintenance in preserving the quality and effectiveness of a sword.