Metonymy is a literary device that uses a <u>specific word</u> (especially a noun) in exchange of a term that represents an <u>idea or an objec</u>t. Metonymy is an example of the use of <u>figurative language</u>, which can enrich the meaning and literary style of a work.
An example of <u>metonymy</u> would be:
I have devoted my <em>soul</em> to you. The word <u><em>soul</em></u>, not only representing the original concept but the act of fully committing to someone.