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Making the derivative expression the clue to implicit metaphor.
Suppose an abstract condition is described as speaking. A standard analysis may locate the figurative transfer in the verb “to speak.” Another analysis first likens the condition to a speaking human, conceals the human comparison source, and then treats attribution of speech as the clue indicating this comparison.
Implicit metaphor: the subject is stated while the comparison source is concealed.
Clue: an associated sign that reveals the concealed comparison.
The two procedures can be demonstrated using the same expression, “the state of affairs spoke.”