Related Clues:

• It secures a measure of progress at sea
• Bird speed
• End of one's rope?
• Macramé element
• Tie that's hard to untie
• Tie, hitch
• Branch bump
• Tough puzzle, metaphorically
• Macramé feature
• Half hitch or bowline
• Rope entanglement
• Macramé basic
• Pretzel�s shape
• A granny?
• Granny or reef