Slipped Overhand Knot
You start the Slipped Overhand Knot the same way you begin tying the Overhand Knot, with one variation — the last tuck is made with a bight of the running end, so that the very end is not pulled through the crossing turn. This is what you do when you tie the bows in your shoelaces.
Pass the running end around the standing part, making a loop; then, make a bight in the running end and pass it through the crossing turn. Pull on the standing part and the bight to tighten.
Whereas the Overhand Knot can be difficult to untie, this knot can be untied simply by pulling on the running end to take out the last tuck, just as you do when you untie shoelaces. However, this trick does not work with all knots, as not all knots can be released by letting out the last tuck.