Englishfor English speakers
baffle
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verb
(= vex, stick, get, beat, bewilder)
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
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verb
check the emission of (sound)
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noun
a flat plate that controls or directs the flow of fluid or energy
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verb
(= foil, frustrate)
hinder or prevent (the efforts, plans, or desires) of
What ultimately frustrated every challenger was Ruth's amazing September surge
foil your opponent
valve
Noun
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A valve is part of a tube that lets liquid or gas go through one way but stops it from going through the other way.
There are four valves in the heart that let blood go in one direction but stop it from going in the other direction.
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A valve is part of a tube that someone can open or close to let water or other things go through.
Open this valve to let water go through the pipe.