A fastening made by tying a piece of string, rope, or something similar. A tangled mass in something such as hair. A knob, protuberance, or node in a stem, branch, or root. An unpleasant feeling of tightness or tension in a part of the body. A small tightly packed group of people. A unit of speed equivalent to one nautical mile per hour, used especially of ships, aircraft, and winds. A small, relatively short-billed sandpiper, with a reddish-brown or blackish breast in the breeding season. Fasten with a knot. Make (something, especially hair) tangled. Cause (a muscle) to become tense and hard.