a knot in wood
a wooden peg
Word Origin for knag
C15: perhaps from Low German knagge
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Examples from the Web for knag
Historical Examples of knag
A novice would strike the knag or knob away from him as soon as he had obtained his opportunity.