Englishfor English speakers
stunt
Noun
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A stunt is something dangerous you might do to get attention.
Jumping over a river on a motorcycle is a dangerous stunt.
The actor did all his own stunts for the movie.
That last stunt almost got you killed!
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A stunt is something that you do that gets you in trouble.
stunt
Verb
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To stunt something is to slow or stop its development.
He was very short because sickness had stunted his growth.
function
Noun
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Something or someone's function is its purpose or its job.
The army sometimes performs a policing function.
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A function is an organised event.
I met Sylvia at a church function last week.
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If mathX/math is a function of mathY/math, then mathX/math exists because of or is affected by mathY/math
The speed of the computer is a function of its main processor.
When you see, mathY=f(X)/math, you read it, "mathY/math is a function of mathX/math". Here the value of mathY/math depends on the value assigned to the variable mathX/math.
function
Verb
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If something is functioning, it is working and is not completely broken.
Her heart stopped, but her brain continued to function.
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If something functions as mathX/math, it does the job of mathX/math.
In this sentence, "sentence" functions as the subject.