1. Sound like a half-formed whistle expressing astonishment, scorn, or dislike 
2. Expresses relief or tiredness
   - phew

Sounds like: few, phew, feu

• hydrophone
• Hydrophyllaceae
• Hydrophyllum
• Hydrophyllum virginianum
• hydrophyte
• hydrophytic
• hydrophytic plant
• hydroplane
• hydroplane racing
• hydroponic
• hydroponics
• hydropower
• hydrops
• hydroquinone
• hydrosphere
• hydrostatic
• hydrostatic head
• hydrostatical
• hydrostatics
• hydrotherapy
• hydrothermal
• hydrothorax
• hydrotropic
• hydrotropism
• hydrous