E. Cobham Brewer 18101897. Dictionary of Phrase and Fable. 1898.
Bollen.
Swollen. (Anglo - Saxon, bolla, a bowl.) Hence joints bolnebig (Golding), and bolne in pride (Phaer). The seed capsule or pod of flax is called a boll.
1
The barley was in the ear, and the flax was bolled.Exod. ix. 31.