boln /boʊln/adjective 1verb 1forms 5 adjective1 •(no longer used) Swollen; puffed out.The Riuer, as running along the side of the City; in a skinne made like flesh, naked, and blevv. His mantle of sea-greene or vvater colour, thinne, and bolne out like a sayle; […] — 1604 verb1 •(no longer used) To swell; to puff.For it is better to Sleepe lyttle and somewhat wyth watching to soke away humous, then immoderatly to bolne, swell and therewyth throughly to be cloyed. — 1576 formsbolned · bolning · bolns · more boln · most boln