Explicit meaning follows clearly from the words and grammar. A possible reading is supported by the construction but needs context. An unsupported interpretation has no adequate linguistic or contextual basis.
For example, “Zaydun ka-l-asad” explicitly compares Zayd to a lion. Yet “Zaydun asadun” must not automatically be called metaphor: with both the compared subject and model expressed, it can be an emphatic comparison (tashbīh balīgh). The actual structure and purpose control the label.