'blown' (past participle of 'blow') originates from Old English, specifically the word 'blāwan', where Proto-Germanic '*blēaną' meant 'to blow'.

'blow' changed from Old English 'blāwan' (and earlier Proto-Germanic '*blēaną') and eventually became the modern English word 'blow'; the past participle form 'blown' developed through regular West Germanic participle formation.

Initially it meant 'to move air' or 'to cause to move by air'; over time related senses developed (for example, 'to burst or break by pressure' and figurative senses like 'to astonish').