swell
To become bigger, especially due to being engorged.
Other meanings
To cause to become bigger.
“Rains and dissolving snow swell the rivers in spring.”
To grow gradually in force or loudness.
“The organ music swelled.”
Word history
From Old English "swellan" (to swell).
Where this comes from
This definition is adapted from “swell” on Wiktionary, by its contributors, published under CC BY-SA 4.0. This page is published under the same licence.