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1. Of a plant, to bloom. I can't wait for the flowers I planted to blossom out and fill our yard with color!
2. Of a person or thing, to develop completely. Amanda was really shy as a kid, but her bubbly personality blossomed out in adulthood. I had a much easier time writing my second novel—the idea for its plot just blossomed out overnight.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
1. Lit. [for a plant or tree] to become covered with flowers. The apple tree blossomed out for the last time.
2. Fig. [for someone or a concept] to develop fully, physically and intellectually. She blossomed out in her studies and her excellent grades showed it. In her last year in school, she blossomed out.
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.