noun
a person who is responsible for maintaining or taking care of a substitute player in a sports team
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The sub keeper is responsible for maintaining accurate records of all subordinates within the department.
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Hey, have you met the new sub keeper in our team?
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The sub keeper is like the MVP of our squad, always keeping things in check.
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In a way, the sub keeper acts as the gatekeeper to the team's success, ensuring everything runs smoothly.