Possible Clues:

• Puncture, collapse like balloon
• Release gas from
• Let down when home gets swamped by river?
• Opposite of blow up
• Let some air out of
• Let down by rising a semitone twice?
• Let down and fed up with being delayed
• Let down level in river
• Dead fed up at first, being let down
• Fed-up - at the last minute let down