Adverb
once and again (not comparable)
(dated) More than once; repeatedly.
A person can go along quite awhile if they get a good day every once and again. Stephen King
Each time a new war is disclosed in the name of the fight of the good against evil, those who are killed are all poor. It's always the same story repeating once and again and again. Eduardo Galeano
No not at all... it is rare for shows to make it as long as Once and Again... It was a pretty good run. Sela Ward