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a figure of speech in which one thing is represented by another that is commonly (and often physically) associated with it. (Not to be confused with synecdoche)
What is metonymy
synecdoche: fig. of speech in which part of something is used to represent the whole
metonymy: referring to a person's handwriting as "his/her/their hand" or calling a monarch "the crown"
synecdoche: referring to a boat as a "sail"