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Linchpin
Importance to Success
Focus on the essential role a 'linchpin' plays in achieving a goal or maintaining stability in a situation or group. 
Metaphoric Use
Understand 'linchpin' is often used metaphorically to describe an indispensable element, not a physical pin. 
Emotional Impact
Recognize that being called a 'linchpin' is an acknowledgment of a person's significant impact and value. 