a cold line up his back


Senior Member
But as he stood there, looking across the street at two men coming out of the Red Apple with a six-pack apiece, he suddenly did know something, remembered something that drew a cold line up his back.
His nerves suggested strongly that it did –the cold line up his back had both widened and deepened.
Source: Insomnia by Stephen King

Did the character actually feel a cold line up his back or is it a metaphor? would it be correct to gloss that bolded clause is almost equivalent to ‘his spine shivered’?

Thank you.
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