Definitions:
a fastening made by looping a piece of string, rope, or something similar on itself and tightening it

a tangled mass in something such as hair or wool.

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, or winds.

fasten with a knot

make (something, especially hair) tangled

cause (a muscle) to become tense and hard.

a small, relatively short-billed sandpiper, with a reddish-brown or blackish breast in the breeding season.