Related Clues:

• Become weary
• Lose tautness, in a way
• Yield to gravity
• Makeshift tree swing
• Become bored or weary
• Lose oomph
• Run down
• Fall down
• Bad thing to blow
• It appears several times in this puzzle, so fill'er up!
• Cheap swing
• Run out of steam
• Lose power
• Tire
• Flow back