Depending on context, checkout can be translated as Kasse or Abmeldung.
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The job description of an assistant checkout person is very
simple. This person must be able to assist the checkout person.
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It is one word.
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My cashier at the store forgot to give me my checkout slip.
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No, that sentence is not grammatically correct. It should be "Is the checkout of a text correct?" or "Is the text checkout correct?" for proper structure.