Definition of first-name basis
◆People who are on a first-name basis know each other well and address each other by their first names. He was on a first-name basis with his boss. They know most of the officials on a first-name basis. —sometimes used figuratively She was on a first-name basis with adversity.
Word by Word Definitions
: the bottom of something considered as its foundation
: the principal component of something
: something on which something else is established or based
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