Definition of backronym in English:

backronym

Syllabification: back·ro·nym
Pronunciation: /ˈbakrəˌnim
 
/

noun

A fanciful expansion of an existing acronym or word, such as “port out, starboard home” for posh.
More example sentences
  • Later, around the mid-1970s, people began to make up backronyms for BASIC because they weren't sure.
  • Choose one and then manufacture a ridiculous backronym to explain it.
  • Actually, looking at the examples here, ‘backronym’ does not mean what I thought it did.

Origin

blend of back and acronym.

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