To fail at something; to mess up; to make a mistake.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "blow it" in a sentence
"First came the anti-G suit that resembled a pair of zippered chaps and also served as backup flotation gear should you want to blow it up in the water."
"But the pitch lacked the velocity Guidry needed to blow it by Rice, who swung and connected late, but by sheer strength seemed topush a low line drive into center field."
"We could not go to her home with projection equipment or take her to a government facility with projection equipment and stop-frame that film and blow it up and give her a decent look."