blow it
Spoil, botch, or bungle something, as in That was a great opportunity, but now I've blown it. [Slang; c. 1940]
The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
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