swelling
US /ˈswel.ɪŋ/
UK /ˈswel.ɪŋ/

1.
a localized abnormal enlargement or protrusion on the body as a result of disease or injury
:
•
The doctor examined the swelling on her ankle.
•
Apply ice to reduce the swelling.
2.
the action of increasing in size, amount, or degree
:
•
The rapid swelling of the river caused concern.
•
We observed a gradual swelling of the population.