synecdoche
noun [ C or U ] language specialized uk/sɪˈnek.də.ki/ us/sɪˈnek.də.ki/
举隅，提喻
a word or phrase in which a part of something is used to refer to the whole of it, for example "a pair of hands" for "a worker", or the whole of something is used to refer to a part, for example "the law" for "a police officer"