Swell, Swollen - Vine's Expository Dictionary of New Testament Words
Swell, Swollen[ 1,,G4092, pimpremi ]
primarily, to blow, to burn," later came to denote "to cause to swell," and, in the Middle Voice, "to become swollen," Acts 28:6. In the Sept., Numbers 5:21-Numbers 5:22, Numbers 5:27.
Note: Some, connecting the word prenes in Acts 1:18 with pimpremi, give it the meaning "swelling up:" See HEADLONG.