A term you'll meet in rhetoric & literature.
Metonymy (pronounced meh-TON-uh-mee) is the figure of speech where one term is replaced by another it is closely associated with. The replacement is not a literal part of the thing it stands for — it is a neighbor, a symbol, a tool, an attribute.
Synecdoche uses a literal part of the thing it names. Metonymy uses something associated with it. "All hands on deck" — synecdoche (hands are part of sailors). "Suits in the conference room" — metonymy (suits are clothing worn by, not part of, businesspeople). The distinction is fuzzy, and many critics treat synecdoche as a sub-type of metonymy rather than a separate figure.
Metonymy is the work-horse of compressed prose. A journalist doesn't write "the executive branch of the United States government announced a new policy" — she writes "Washington announced." The associative substitution is faster, idiomatic, and quietly editorial: choosing which associated term to use is an argument about what the institution really is. "The Beltway" makes Washington feel insular; "the West Wing" makes it feel intimate; "1600 Pennsylvania Avenue" makes it sound formal.
Metonymies are most powerful when you stop noticing them. When a poet writes "the sceptre trembles," he is making the abstract noun authority physical and shaky. When a politician says "let history judge," history isn't a judge — it's the metonymic stand-in for the future verdict of historians and readers. Reading metonymy carefully means asking what concrete thing has been swapped in for the abstract one, and what that swap quietly says.
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