I know hundreds of people who have spent years and thousands of dollars on tests looking for ulcers or spastic bowels. I tell them to lay off all dairy products for two weeks. The results are usually so striking that it changes their lives.
—David Jacobs
metonymy
A figure of speech in which one word is substituted for another with which it is closely associated. For example, in the expression The pen is mightier than the sword, the word pen is used for "the written word," and sword is used for "military power."