Related Clues:

• Sound of exasperation
• [I give up]
• Frustrated one's exhalation
• Charlie Brown's refrain
• Sound weary
• ___ of relief
• Sound with 23-Across
• Exhale sadly
• Moan
• Exhalation of breath, with relief say
• Audible exhalation of breath
• It means to be sad, but never in short pants
• Sadly, that's one way to draw 27 down
• Act relieved
• Exhalation of breath, of relief say