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Definition of Metaphorical extension
1. Noun. A noun meaning the process as the language changes over time in linguistics wherein the meaning of or part of the sense of a word which was used as a portion of a popularized ''metaphorical phrase'' is transferred back to and subsequently becomes one of the accepted general meanings of the original word used in the phrase . (Example mouse, in computing from computer mouse, an input device which possessed a metaphorical tail.) ¹
2. Noun. The part of the definition of a word which has undergone a such meaning change. ¹
¹ Source: wiktionary.com