A person or thing that centers something, or in rugby, a player who plays in the center position.
From 'centre' + '-er' (agent suffix indicating a person or thing that performs an action). Common English formation that can apply to any action or position involving centering.
In rugby culture, being called 'a great centrer' is high praise—it means you're the player everyone trusts to make the crucial decisions right in the middle of the action where chaos reigns!
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