To cause to flower or bloom; to bring into flower, or metaphorically, to cause something to reach full development.
From 'ef-' (out) + 'flower,' a direct construction meaning to bring flowers out. Much less common than 'effloresce' and likely influenced by it or created as a parallel formation.
This word barely appears in English literature—'effloresce' won the competition for the best-sounding 'reaching full bloom' verb, pushing 'efflower' into near-total obscurity.
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