Related Clues:

• Gordius' challenge
• Muscle complaint
• Heart surgeon's concern
• Ball of string?
• Bowline or clove hitch
• It may stop a saw
• Granny ___
• Clump of hair
• It might be square
• Cardiology concern
• Square __
• It's tied in church
• Blood line?
• Half hitch, for one
• Part of a tied tie