Definitions of knot:

• noun:   a sandpiper that breeds in the arctic and winters in the southern hemisphere
• noun:   any of various fastenings formed by looping and tying a rope (or cord) upon itself or to another rope or to another object
• noun:   a tight cluster of people or things

  Example: "A small knot of women listened to his sermon"

• noun:   something twisted and tight and swollen

  Example: "Their muscles stood out in knots"

• noun:   a hard cross-grained round piece of wood in a board where a branch emerged

  Example: "The saw buckled when it hit a knot"

• noun:   soft lump or unevenness in a yarn; either an imperfection or created by design
• noun:   a unit of length used in navigation; equivalent to the distance spanned by one minute of arc in latitude; 1,852 meters
• verb:   tie or fasten into a knot

  Example: "Knot the shoelaces"

• verb:   make into knots; make knots out of

  Example: "She knotted der fingers"

• verb:   tangle or complicate