noun
a sharp or critical point
adjective
describing the quality of being tidy and orderly
preposition
showing the relationship between 'neat' and 'pin'
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The documents were organized as neat as a pin in the filing cabinet.
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She always keeps her desk as neat as a pin.
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Her outfit was as neat as a pin for the party.
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The presentation was as neat as a pin, with every detail perfectly in place.