noun Also by.
Origin of bye1
British Dictionary definitions for by the bye (1 of 2)
Word Origin for bye
British Dictionary definitions for by the bye (2 of 2)
Idioms and Phrases with by the bye
by the bye
Also, by the by. Incidentally, in passing, as in By the bye, my wife is coming too, or Exactly where do you live, by the by? The bye or second by in this term originally meant “a side path,” whence the current sense of “off the track” or “of secondary importance.” [Early 1500s] Also see by the way.