full-blown
UK: /ˌfʊl ˈbləʊn/ | US: /ˌfʊl ˈbloʊn/
adj. completely developed or matured
adj. (of a flower) fully open
adj. (of a situation) at its most intense or extreme stage
The term "full-blown" originated in the 16th century, combining "full" (from Old English full, meaning "complete") and "blown," the past participle of "blow." Initially, it described flowers fully opened by the wind ("blown"). By the 17th century, it metaphorically extended to anything fully developed or at its peak, such as diseases or crises. The logic hinges on the imagery of natural expansion (flowers) applied to abstract growth.
The garden was vibrant with full-blown roses.
By then, the scandal had become a full-blown political crisis.
She displayed full-blown symptoms of the illness within days.
The project evolved into a full-blown business venture.
His talent was full-blown by the time he reached adulthood.