 If someone is "fishing" for information, we do not imagine that the person is anywhere near the ocean; rather, we transpose elements of the action of fishing (waiting, hoping to catch something that cannot be seen, probing) into a new domain (a conversation).Thus, metaphor works by presenting a target set of meanings and using them to suggest a similarity between items, actions, or events in two domains, whereas metonymy calls up or references a specific domain (here, removing items from the sea).Sometimes, metaphor and metonymy may both be at work in the same figure of speech, or one could interpret a phrase metaphorically or metonymically.