You use the word metaphorical to indicate that you are not using words with their ordinary meaning, but are describing something by means of an image or symbol.
例句
It turns out Levy is talking in metaphorical terms...利维原来说的是一种比喻。The ship may be heading for the metaphorical rocks unless a buyer can be found.除非可以找到买家，否则这条船也许就像朝着岩石撞过去一样下场悲惨。
英英词典释义
Adjective
1. expressing one thing in terms normally denoting another;