Blown it means to have failed, messed up, ruined opportunity, or made serious mistake that causes loss or disappointment. For example, I blew it on test means I failed test, or he blown it with girl means he ruined chance with her. It implies you had opportunity and wasted it due to error. In sports, blown it means team lost lead or missed chance to win. In everyday use, blown it expresses regret for mistake, as in I really blown it this time. Origin comes from blow meaning to spoil or bungle. It can also mean to have made something worse, as in you blown it now means you made situation worse. So blown it means to have failed, ruined, or messed up, often with sense of personal responsibility for failure, similar to phrases like messed up, screwed up, or dropped the ball, used informally to admit mistake and express regret for lost opportunity.
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