What is the meaning of the verb "whisper" in the sentence below?
Her gaze whispered down the white cotton spread tight over a sinewy chest and wide shoulder.
Source C. C. Hunter, Reborn (2014)
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This is strictly poetic/literary usage. The word does not literally fit at all, because people cannot actually make a sound (even a quiet one!) just by looking at something with their eyes.
In this context, "whisper" is used because it suggests quietness, softness, and intimacy. You have to be very close to whisper successfully. The word choice is probably also influenced by the use of "whisper" to describe the sound made by rustling fabric. It would be not uncommon to say that the white cotton "whispered" in the breeze, or something like that.