Related Clues:

• Breathe
• Audibly lament
• Sound of relief
• It's often heaved
• It might evoke pity
• Beginning of of relief?
• Expression of weariness
• Charlie Brown utterance
• Weariness giveaway
• Exhale wistfully
• Sound of sorrow
• Resigned sound
• Lovelorn utterance
• Plaintive sound
• Unuttered 'alas'