past participle of blow
"The wind blew the leaves around until they were blown across the entire yard."
being moved or acted upon by moving air or vapor
"blown clouds of dust choked the riders"
"blown soil mounded on the window sill"
breathing laboriously or convulsively
"After running up the steep hill, she was blown and could barely catch her breath."
distended, swollen or inflated
"After eating too many beans, his stomach looked visibly blown from all the gas trapped inside."
In plain English: Blown means something has been damaged beyond repair, ruined completely, or destroyed by strong wind.
"The balloon was blown away by the sudden wind storm."
The word "blown" comes from the Old English verb blāwan, which meant to blow air or smoke. It evolved through Middle English as the past participle form of this original verb.