noun
a person who is designated as the main contact or representative for a particular group or organization
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The point person for the project will be responsible for coordinating all communication among team members.
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If you have any questions, just ask Sarah - she's the point person for this event.
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Jen is the go-to person for this task, she's the point person for all updates.
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In the game of chess, the queen is often referred to as the point person, as she is the most powerful piece on the board.