I came across the following definition of metonymy.
I can understand the use of "Capitol Hill" to mean "US Congress" (for example, I saw a headline like this: New changes on Capitol Hill leads to the largest freshman class for the House of Representatives in over half a century.)metonymy (miton'umē) [key], figure of speech in which an attribute of a thing or something closely related to it is substituted for the thing itself. Thus, “sweat” can mean “hard labor,” and “Capitol Hill” represents the U.S. Congress.
But I don't know how to use "sweat" to mean "hard labor". Could you please give me an example?
"Finishing my thesis took a lot of time and a lot of sweat, but I did it!"
By the way, the phrases "sweat and tears" and "sweat and blood" mean lots of hard work, heartache, pain, sacrifice, etc.
Thank you riquecohen and acslater017. Thanks for the information regarding those two phrases acslater017.