[Grammar] an object that you use to help you do something

kadioguy

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In the OALD, it writes:

aid
noun

an object, a machine, etc. that you use to help you do something
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If I say 'an object, a machine, etc. that you use to help yourself do something', is it also acceptable? :)
 

GoesStation

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kadioguy

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Student or Learner
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Could you tell me more?

For example, it is correct that 'Be careful with that knife or you'll cut yourself!', but why is 'an object, a machine, etc. that you use to help yourself do something' wrong?
 
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