What is "slip knot"

n. 1 A knot which attaches a line to an object and tightens when pressure is applied. Also called a running knot. 2 A knot which attaches a line to the middle of another, allowing it to slide

The slip knot is a stopper knot which is easily undone by pulling the tail ( working end). The slip knot is related to the running knot, which will release when the standing end is pulled. Both knots are identical and are composed of a slipped overhand knot, where a bight allows the knot be released by pulling on an end; the working end for a slip knot, and the standing end for a running knot. The slip knot is used as a starting point for crochet and knitting.