"Abziehen" (honing) refers to straightening the bent edge of a knife. The bending of the edge can be caused by various actions. Most often, this happens when you push the food into the pan with the knife's edge instead of its spine. Regular cutting also causes the edge to gradually bend. Then, a honing steel or a sharpening stone is used. However, if a knife can no longer be sharpened by honing, the only option is to go to a professional or use a sharpening stone with the appropriate grit. Usually, a grit of 240 is used for this purpose.