Related Clues:

• Two-by-four flaw
• Perplexity
• Tie-up
• Board defect
• Sailor's unit
• Word with Gordian or slip
• Shipwreck cause, sometimes
• Sea mile
• Large wading bird
• Bad spot for a nail
• A bride ties it
• Granny, for one
• Square, e.g.
• ''Riddle-me-___!'' (''Guess!'')
• Muscle malady