The phrase "a thick rope of" is correct and usable in written English.
It can be used to describe a rope that is substantial in thickness, often in a metaphorical or literal context.
Example: "He pulled on a thick rope of ivy that hung from the old tree, trying to climb up to the branch."
Alternatives: "a sturdy rope of" or "a heavy rope of".
He plaited a thick rope of suspense from strands that initially seem inconsequential, and the music found and underlined these longer threads, creating and holding and intensifying a mood across multiple scenes, keeping one aware of the bigger picture.
She felt around in the blocked sink with her rubber gloves, poking into the plughole with the toothbrush, pulling at the ends of the fibres caught in the trap, tugging and coaxing until she began to deliver up out of the drain a nasty mass, a thick rope of hair and soap and matted insulation, in a gulp of bad drain smell.
Ms. Antoni's portentous installation consists of two giant industrial spools with a thick rope of blond human hair stretched between them; on the floor is a big pile of raw hair into which the artist fell during a preopening, tightrope performance.
John's friend Tony had dozens of tattoos, including a thick rope of barbed wire wrapped around one calf.
My hangover began to drift away on the tide and all was well with the world, until a thick rope of seaweed wound about my leg and began to pull me under.
Begin twisting the hair altogether, making a thick rope of your hair.
Out on the deck of the Sunset Towers at 11 P.M. last night, a shooting star, a fat, thick rope of light, split a remarkably clear L.A. sky as it ripped down toward the downtown lights.
First came rock climbing and then a Tarzanesque leap from a thick rope into a pit of foam-rubber cubes.
"It's a thick rope that you attach to a base of a wall and has a loop," he said.
Pinch of a portion of clay and roll it out into a thick rope.
As other robots perform, Rope Climber works its way up a thick rope hanging from the ceiling.
