deflater

/dɪˈfleɪtər/
noun
  1. A device or tool used to let air or gas out of something, such as a tire or inflatable object.
    • A deflater is handy when you need to pack inflatable furniture.
    • The pool toy came with a small deflater for easy storage.
    • He used a tire deflater to quickly release air from the off-road tires.
  2. A person or thing that reduces someone's confidence, pride, or enthusiasm.
    • His constant criticism made him a real deflater of team morale.
    • She tried to be a deflater of his arrogance, but he didn't listen.
    • The negative review was a deflater for the young author.
Antonyms
What does "deflater" mean? | whatsthatwordmean | whatsthatwordmean