early 15c., "inflated," from Old English blawen, past participle of blow (v.1). Figurative sense of "inflated by pride" is from late 15c. Meaning "out of breath" is from 1670s. As a past-participle adjective from blow (v.2), it was Old English geblowenne.
blown soil mounded on the window sill
blown clouds of dust choked the riders
blow-fly
blow-gun
blowhard
blow-hole
blow-job
blown
blow-out
blow-pipe
blow-torch
blowzy
BLT