ichidan verb, intransitive verb
swell; become swollen
Intransitive verb for body parts swelling due to inflammation, injury, or fluid retention. Often used with が to mark the swollen part.
虫に刺されて、腕が腫れた。
My arm swelled up after being bitten by a bug.
泣きすぎて目が腫れてしまった。
I cried so much that my eyes became swollen.