knot
/nɒt//nɑt/noun
Definitions
A looping of a piece of string or of any other long, flexible material that cannot be untangled without passing one or both ends of the material through its loops.
Example: Climbers must make sure that all knots are both secure and of types that will not weaken the rope.
(of hair, etc) A tangled clump.
Example: The nurse was brushing knots from the protesting child's hair.
A maze-like pattern.
A non-self-intersecting closed curve in (e.g., three-dimensional) space that is an abstraction of a knot (in sense 1 above).
Example: A knot can be defined as a non-self-intersecting broken line whose endpoints coincide: when such a knot is constrained to lie in a plane, then it is simply a polygon.
verb
Definitions
To form into a knot; to tie with a knot or knots.
Example: We knotted the ends of the rope to keep it from unravelling.
To form wrinkles in the forehead, as a sign of concentration, concern, surprise, etc.
Example: She knotted her brow in concentration while attempting to unravel the tangled strands.
To unite closely; to knit together.
To entangle or perplex; to puzzle.