With a capital A, B, etc.
Definition 1 of 1

Emphasis Marker
The phrase gives extra weight to the quality being described, making it more significant.

He's optimistic with a capital O about the team's chances.
Personification
Words get a personality trait; they 'wear' the capital letter like a badge of honor.

This movie is Cheesy with a capital C.
Speech Enhancer
When spoken, stress the capital letter for a dramatic effect in conversations.

She was Cold with a capital C, not even a goodbye!
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