Brahe 
(brä, brähē, bräə), Tycho 1546-1601.
(brä, brähē, bräə), Tycho 1546-1601. Danish astronomer whose accurate astronomical observations formed the basis for Johannes Kepler's laws of planetary motion.
- bygone
- by half
- by halves
- by hand
- by heart
- by hook or by crook
- by/in virtue of
- by Jove
- bylaw
- by leaps and bounds
- byline
- by-line
- byliner
- by means of
- by-name
- by no means
- BYOB
- by one's bootstraps
- by oneself
- by (one's) (own) bootstraps
- by one's own bootstraps
- by (or in)fits and starts
- by (or in) fits and starts
- by own bootstraps
- bypass