baffle

Noun

• a flat plate that controls or directs the flow of fluid or energy

Verb

• check the emission of (sound)

• hinder or prevent (the efforts, plans, or desires) of
  • What ultimately frustrated every challenger was Ruth's amazing September surge
    
  • foil your opponent
    

• be a mystery or bewildering to
  • This beats me!
    
  • Got me--I don't know the answer!
    
  • a vexing problem
    
  • This question really stuck me
    

Related words

• Synonyms: 
  baffle board , regulate , thwart , queer , spoil , scotch , foil , cross , frustrate , bilk , perplex , vex , stick , get , puzzle , mystify , beat , pose , bewilder