Definitions from Wiktionary (on a first-name basis)
▸ adverb: (idiomatic) Having enough familiarity with another person to call them by their first name, as opposed to their surname.
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▸ adverb: (idiomatic) Having enough familiarity with another person to call them by their first name, as opposed to their surname.
Similar:
informal,
familiar,
friendly,
casual,
close,
beknown,
acquaintance,
acquainted,
common knowledge,
famously,
more...
▸ Words similar to on a first-name basis
▸ Usage examples for on a first-name basis
▸ Idioms related to on a first-name basis
▸ Wikipedia articles (New!)
▸ Words that often appear near on a first-name basis
▸ Rhymes of on a first-name basis
▸ Invented words related to on a first-name basis