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bloomer

bloomer /ˈbluːmɚ/ noun
plural bloomers
bloomer
/ˈbluːmɚ/
noun
plural bloomers
Britannica Dictionary definition of BLOOMER
[count]
: a plant that blooms at a specified time
British, informal + somewhat old-fashioned : an embarrassing mistake

late bloomer

US
: someone who becomes successful, attractive, etc., at a later time in life than other people