GUY

a rope, cord, or cable attached to something as a brace or guide

especially a tent
"guy rope"
"guy wire"
"guy cable"

steady or support with a guy wire or cable
"the Italians guyed the tower of Piza"

"They needed to make sure that they had something dependable to guy the tree."

"The tent needed some sort of guy wire attached to a the ground so that the tent wouldn't blow away."

"He got rid of the wire only realizing later when it was too late that it had been serving as a guy for the post that was now falling into his mother's garden."