I suppose 40 years ago they were a potent metaphor for open roads and freedom.
Times,Sunday Times
Fishing would, for him, become a potent metaphor for the act of writing poetry.
Times, Sunday Times
Her perpetual potential for confusing 'a potent metaphor' with 'an unexpected accessory'.
Times, Sunday Times
One account mentions him building sets for silent films a potent metaphor for what was to come.
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