Knot or not?

noun 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

Climbers must make sure that all knots are both secure and of types that will not weaken the rope

verb To form into a knot; to tie with a knot or knots

We knotted the ends of the rope to keep it from unravelling

noun One of a variety of shore birds; red-breasted sandpiper (variously Calidris canutus or Tringa canutus)

noun A tangled clump of hair or similar

The nurse was brushing knots from the protesting child's hair

verb To form wrinkles in the forehead, as a sign of concentration, concern, surprise, etc

She knotted her brow in concentration while attempting to unravel the tangled strands

noun A maze-like pattern

verb To unite closely; to knit together

noun A non-self-intersecting closed curve in (e.g., three-dimensional) space that is an abstraction of a knot (in sense 1 above)

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

adverb Negates the meaning of the modified verb

Did you take out the trash? – No, I did not. I do not think it was my turn, was it?

conjunction And not

I wanted a plate of shrimp, not a bucket of chicken

interjection slangUsed to indicate that the previous phrase was meant sarcastically or ironically

Near-synonyms: I don't think; psych; bender (obsolete, UK)

noun An instance of using the word “not”; a negation or denial

noun A unary operation on logical values that changes true to false, and false to true

noun Abbreviation of notice

Mon. Not. R. Astron. Soc

adverb To no degree

That is not red; it's green

noun Alternative letter-case form of NOT (“unary operation on logical values that changes true to false, and false to true”)