Primary versus derivative metaphor

Majaz and Istiara: Literal Meaning, Relationship, Contextual Evidence, and Types of Metaphor

TypeExpression bearing transferExample
PrimaryUnderived nounDarkness for misguidance
DerivativeVerbRiding for clinging insistently
DerivativePrepositionUpon guidance for secure adherence

Both morphological form and rhetorical use must be analyzed. One metaphor can be both explicit and primary: these are classifications along different dimensions.