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

[ Syn: baffle board ]

be a mystery or bewildering to; This beats me!; Got me--I dont 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 ]

hinder or prevent (the efforts, plans, or desires) of; What ultimately frustrated every challenger was Ruths amazing September surge; foil your opponent

[ Syn: thwart , queer , spoil , scotch , foil , cross , frustrate , bilk ]

check the emission of (sound)

[ Syn: regulate ]