Phrase(s): blossom out
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.
McGrawhill's American Idioms And Phrasal Verbs