1. A flat plate that controls or directs the flow of fluid or energy (synset 102775873)
  1. Be a mystery or bewildering to (synset 200624056)
    "This beats me!"; "Got me--I don't know the answer!"; "a vexing problem"; "This question really stuck me"
  2. Hinder or prevent (the efforts, plans, or desires) of (synset 202563998)
    "What ultimately frustrated every challenger was Ruth's amazing September surge"; "foil your opponent"
  3. Restrain the emission of (sound, fluid, etc.) (synset 200235689)

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