How to pronounce “purl” in English

When the dark purple organs explode from the animal's posterior, he startles and flails, attempting to back away quickly.The guts purl and twist in his turbulence, forming a kinetic design of dark ribbons, diffusing colors, and loose, round forms at the center of our circle.From the bottom of this turning mobile, the cucumber body sinks toward the sea floor." So later that same day, I was sitting