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Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • There ain't no such thing as a free lunch; something advertised as being "free" will invariably have hidden costs.

Etymologies

Acronym, originating in the early 20th century, and popularized by Robert Heinlein's novel, The Moon is a Harsh Mistress. (Wiktionary)

Examples

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