noun
a person, place, thing, or idea
adjective
a word that describes or gives more information about a noun
preposition
a word that shows the relationship between a noun (or pronoun) and other words in a sentence
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The open door policy allows employees to freely communicate with management.
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Just knock before you enter, we usually have an open door policy around here.
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Hey, the boss has an open door if you need to chat about anything.
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His willingness to listen was like an open door in a world full of closed minds.