Sentence:  The next group of computational approaches to <WSD>metaphor</WSD> assume that <WSD>metaphor</WSD> is basically a hidden analogy. 
Meaning of the word marked with <WSD> tags:  The use of a word or phrase to refer to something that it is not, invoking a direct similarity between the word or phrase used and the thing described (but in the case of English without the words "like" or "as", since use of those words would imply a simile); the word or phrase used in this way; an implied comparison.