Metonymy

Definition: A rhetorical device in which one term is used as a substitute for another, based on an implied relationship between them (e.g., part–whole, cause–effect, producer–product, place–institution).

• The metonymic substitution is conventional and unambiguous in context (e.g., “The White House announced…” clearly refers to the administration, not the building).
• It is used as a recognized literary or rhetorical device without carrying argumentative weight.
• The relationship between substitute and referent is transparent and cannot be reasonably misinterpreted.

• A metonymic term shifts its referent within an argument: e.g., “animals” refers to species in one premise but to individual organisms in another (pars pro toto / totum pro parte).
• The substitution is used to smuggle in a different scope of reference than the listener assumes – particularly with collective terms where “the group” vs. “a member of the group” is conflated.
• A place or institution name (“Berlin”, “Wall Street”) is used ambiguously to refer sometimes to the physical location, sometimes to the people/institution there, and sometimes to a policy position attributed to them.

• Metonymy is a sub-form of equivocation. The key distinction: in metonymy, the same word stands in for something else via an implied relationship; in plain equivocation/homonymy, the word has genuinely unrelated meanings.
• Common sub-types: pars pro toto (part for whole), totum pro parte (whole for part), cause for effect, producer for product, antonomasia (description instead of name).

• Equivocation (MD) – the parent category. Ask: is the ambiguity due to a word having unrelated meanings (→ equivocation/homonymy), or to a term standing in for something else via an implied relationship (→ metonymy)?
• Mereological fallacy (MD) – attributing properties of parts to the whole or vice versa. Ask: is this about a term shifting referent between part and whole (→ metonymy), or about an invalid inference from part-level to whole-level properties (→ mereology)?
• Motte-and-Bailey (MD) – deliberately conflating a defensible position with an indefensible one. Ask: is this a single term shifting its referent via an implied relationship (→ metonymy), or are two distinct positions/claims being swapped to avoid criticism (→ motte-and-bailey)? Note that a claim can be both.

Input: “Brussels doesn't really know what small businesses need.”
Output: “Brussels” is a metonym – most likely for EU institutions, but depending on context could refer to the Belgian government, NATO, Eurocontrol, or other bodies based there, and of course the citizens of both the City and the Region of Brussels. The claim is imprecise because it's unclear which of these is meant, and sweeping (“doesn't really know”) because no specific policy, department, or decision is identified. To make this checkable: name the specific body and the specific regulation or decision being criticized.

Input: “Hollywood is responsible for the decline in moral standards. I visited Hollywood last summer and it was just a bunch of studios.”
Output: “Hollywood” shifts from meaning “the film industry and its cultural influence” (first sentence) to “a physical location in Los Angeles” (second). Each usage is fine individually, but treating both referents as interchangeable undermines any argument built on them.

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