From Longman Dictionary of Contemporary Englishblow sb↔ away phrasal verb especially American English informal1 SURPRISEDto make someone feel very surprised, especially about something they like or admire It just blows me away, the way everyone’s so friendly round here.2 KILLto kill someone by shooting them with a gun3 BEAT/DEFEATto defeat someone completely, especially in a game Nancy blew away the rest of the skaters. → blow→ See Verb table
Examples from the Corpus
blow away• If you use a powder supplement, damp the feed to prevent the horse from blowing it away!• It was so much dust, and the slightest wind would blow it away.• She places it on her finger and blows it away.• The handsome one blew him away.• One song will blow your head away and the next song will mellow out.• You can blow it away with a blink of an eye.• Philip Seymour Hoffman blows them all away with a scene - stealing black comic turn as Dickie's awful preppie buddy.• From the sound of it he'd blow you away without a second thought. 