bloomer

Meanings

1. 1
   noun

   a stupid mistake; also a plant that flowers

   Forgetting the client's name was a real bloomer.

In the blunder sense, British slang from the late 19th century, probably from 'blooming error' (blooming being a euphemism for 'bloody'). The plant sense is from bloom ('to flower') + -er, from Old Norse blóm ('flower').

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