noun
a word that functions as the name of a specific person, place, thing, or idea
preposition
a word that shows the relationship between a noun (or pronoun) and other words in a sentence
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The substitute teacher will stand in for the regular teacher while she is on maternity leave.
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Can you stand in for me at the meeting tomorrow? I have a doctor's appointment.
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I need someone to stand in for me at work this weekend. Any takers?
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The new intern will stand in for the experienced employee until he returns from his vacation.