Definition of running bowline in US English:

running bowline

noun

  • A running noose formed by tying a bowline knot at one end of a rope and passing the other end through the resulting loop; a similar noose used when one end of the rope is already fast, formed by tying a bowline knot around the standing part of the rope.

Origin

Early 18th century; earliest use found in Charles Shadwell (fl. 1692–1720).