bye 1 also by (bī)
1. A secondary matter; a side issue.
2. Sports The position of one who draws no opponent for a round in a tournament and so advances to the next round.
by the bye/by
By the way; incidentally.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
The American Heritage Dictionary Blog
Check out our blog, updated regularly, for new words and revised definitions, interesting images from the 5th edition, discussions of usage, and more.