Yes it is becase a Metaphor is 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, which would imply a simile); the word or phrase used in this way; an implied comparison.
Hm, It could be a metaphor because a figure of speech in which a word or phrase is applied to an object to which it is not literally applicable For example.. "She has a heart of a lion" said Marcus.
