1. bump or knob: a small hard knob or protuberance
2. ridge used for gripping: a ridge, especially one in a series that runs along the edge of something such as a thumbscrew that makes it easier to grip
transitive verb (past and past participleknurled, present participleknurl·ing, 3rd person present singularknurls)
Definition:
make something ridged: to put ridges on something, especially to make it easier to grip
