If he might use the metaphor, he said, he was their spiritual accountant; and he wished each and every one of his hearers to open his books, the books of his spiritual life, and see if they tallied accurately with conscience.
He uttered the metaphor with a certain homely energy and, encouraged by his own voice, proceeded: "You see, we may as well all admit we’re a nice collection of scoundrels, one and all.
There are no more uses of "metaphor" in the book.
Show samples from other sources
He was speaking metaphorically when he referred to being mugged by reality.
It was falling so hard that it looked like white sparks (and this is a simile, too, not a metaphor).
Mark Haddon -- The Curious Incident of the Dog in the Night-time