kink
noun
°A tight curl, twist, or bend in a length of thin material, hair etc.
"We couldn't get enough water to put out the fire because of a kink in the hose."
°A difficulty or flaw that is likely to impede operation, as in a plan or system.
"They had planned to open another shop downtown, but their plan had a few kinks."
verb
°To form a kink.
°To be formed into a kink.