baffle
     n : a flat plate that controls or directs the flow of fluid or
         energy [syn: {baffle board}]
     v 1: 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" [syn: {perplex}, {vex}, {stick},
           {get}, {puzzle}, {mystify}, {beat}, {pose}, {bewilder},
           {flummox}, {stupefy}, {nonplus}, {gravel}, {amaze}, {dumbfound}]
     2: hinder or prevent (the efforts, plans, or desires) of; "What
        ultimately frustrated every challenger was Ruth's amazing
        September surge"; "foil your opponent" [syn: {thwart}, {queer},
         {spoil}, {scotch}, {foil}, {cross}, {frustrate}, {bilk}]
     3: check the emission of (sound) [syn: {regulate}]
Source: WordNet® 2.0