Metonymy

Definition and stakes

W. F. Webster,  English: Composition and Literature

“ Metonymy is the substitution of the name of one thing for that of another to which the former bears a known and close relation. The most common of these known and close relations are those of cause and its effects, of container and the thing contained, and of sign and the thing signified. “He has read Shakespeare,” “He was addicted to the use of the bottle,” “All patriots fight for the flag,” are examples of metonymy. ”
Source: Gutenberg

F. V. N. Painter,  Elementary Guide to Literary Criticism

“ When we say, for example, that "gray hairs are venerable," we mean old age, putting an effect for the cause. In the sentence, "Socrates drank the fatal cup," the container is put for the thing contained, namely, the deadly hemlock.
The general effect of metonymy is to bring before the mind a definite image, and thus to impart a graphic quality to the style. To say, "The pen is mightier than the sword," is more graphic and forcible than to say, "Literature is mightier than war."
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Source: Gutenberg

F. V. N. Painter,  Elementary Guide to Literary Criticism

“ Nearly all great writers, especially poets, enrich their style by the use of figures.
35. Kinds of Figures. There are various kinds of figures, which may be reduced, however, to three classes or groups. The figures based upon resemblance are simile, metaphor, personification, and allegory. Those founded on contiguity are metonymy, synecdoche, exclamation, hyperbole, apostrophe, and vision. Those resting upon contrast are antithesis, climax, epigram, and irony. Other forms of classification have been proposed. There are figures of diction and figures of thought
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Source: Gutenberg

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