on a first-name basis

idiom

Definition of on a first-name basis 

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 to She was on a first-name basis with adversity.

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Last Updated

21 Aug 2018

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