Definition of on a first-name basis in English:

on a first-name basis

Having a friendly and informal relationship: an amateur ecologist who is on a first-name basis with most reptiles
More example sentences
  • We are on first-name terms with many of the staff, who have been great and there are some really big personalities among them.
  • I find it so much more pleasant to work with people on first-name terms.
  • He is on first-name terms with every national newspaper editor, goes on holiday with the present editor of The Sun, and counts television executives and celebrities among his impeccable social contacts.
See parent entry: first name

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Word of the day envenom
Pronunciation: ɪnˈvɛnəm
verb
put poison on or into; make poisonous