Etymology
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Metro (n.)

Paris underground, 1904, from French abbreviation of Chemin de Fer Métropolitain "Metropolitan Railway" (see metropolitan (adj.)). French chemin de fer "railroad" is literally "iron road." Construction began in 1898.

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MGM 

abbreviation of Metro Goldwyn-Mayer, U.S. movie studio noted for the roaring lion in its emblem, attested from 1933.

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