The term 'end of one's rope' is a phrase used to describe a situation in which someone has reached the limit of their patience, resources, or energy. This phrase can be broken down into two crossword solutions: KNOT (4 letters) and NOOSE (5 letters). A KNOT is a type of fastening made by tying a piece of string or rope in a loop. A NOOSE is a loop of rope with a running KNOT at one end, which can be used to hang someone or something. Together, these two solutions represent the idea of being at the end of one's rope.