According to my Webster’s New Collegiate Dictionary, a Merriam-Webster, “metaphor” has two meanings:
1: a figure of speech in which a word or phrase literally denoting one kind of object or idea is used to suggest a likeness or analogy between them (as in the ship plows the sea)
; broadly: figurative language – compare SIMILE
2: an object, activity, or idea treated as a metaphor
My copy was copyrighted in 1973. The current definition can be checked at
I had trouble in school with metaphors. They don't come labeled with "like" or "as". Donald J. Trump is smart. He went to Wharton. He probably considers metaphors staples.