/ˈnɑt/
1.n.a tight cluster of people or things
“a small knot of women listened to his sermon”
2.n.any of various fastenings formed by looping and tying a rope (or cord) upon itself or to another rope or to another object
3.n.a hard cross-grained round piece of wood in a board where a branch emerged
“the saw buckled when it hit a knot”