loop knot used to form single or double endline loop(s) in a rope. often to attach items to the rope (see bowline on a bight. running bowline).

Merriam-Webster Online Dictionary
bowline (noun)
1.
a rope used to keep the weather edge of a square sail taut forward
2.
a knot used to form a loop that neither slips nor jams - see knot illustration
bowline (Wikipedia)
Bowline
Palstek innen.jpg
NamesBowline, boling knot (archaic)
CategoryLoop
OriginAncient
RelatedSheet bend, double bowline, water bowline, Yosemite bowline, Spanish bowline, Portuguese bowline, triple bowline, bowline on a bight, running bowline, poldo tackle, Eskimo bowline, cowboy bowline, Cossack knot, Kalmyk loop
ReleasingJamming
Typical useMaking a fixed loop in the end of a line
CaveatWhile widely considered a reliable knot, when tied in certain materials or loading conditions it may not hold. Tends to work itself loose when not under tension.
ABoK#1010, #1716
Instructions[1]

The bowline (/ˈblɪn/ or /ˈbln/) is an ancient and simple knot used to form a fixed "eye" at the end of a rope. It has the virtues of being both easy to tie and untie; most notably, it is easy to untie after being subjected to a load. The bowline is sometimes referred to as King of the knots because of its importance. Along with the sheet bend and the clove hitch, the bowline is often considered one of the most essential knots.

The common bowline shares some structural similarity with the sheet bend. Virtually all end-to-end joining knots (i.e., bends) have a corresponding eye knot.

Although the bowline is generally considered a reliable knot, its main deficiencies are a tendency to work loose when not under load, to slip when pulled sideways and the bight portion of the knot to capsize in certain circumstances. To address these shortcomings, a number of more secure variations of the bowline have been developed for use in safety-critical applications.

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