from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A common expression whose wording is not subject to variation.
  • n. A common expression whose words cannot be replaced by synonymous words without compromising the meaning.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an expression whose meanings cannot be inferred from the meanings of the words that make it up


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