Old English blegen "a sore, blister, pustule, inflammatory swelling on the body," from Proto-Germanic *blajinon "a swelling" (source also of Danish blegn, Dutch blein), from PIE *bhlei- "to swell," from root *bhel- (2) "to blow, swell."
black-tie
blacktop
bladder
blade
blah
blain
Blaise
blame
blamed
blameless
blameworthy