on a first-name basis
idiom
US
: having a close personal relationship where each person addresses the other by their first name
He was on a first-name basis with his boss.
They know most of the officials on a first-name basis.
—sometimes used figuratively to describe something that one is familiar with or accustomed toShe was on a first-name basis with adversity.
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Merriam-Webster unabridged
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