Then she lifted her face to him again, and he saw her sense of purpose sharpen.

Their sense of smell sharpened; they were always alert to danger.

And then as my senses sharpened, I knew that warmth was her.

All his senses had shifted and sharpened along with his shape.

He saw every flutter among the trees as possible danger, and his senses sharpened to them.

It was coming fast, and her sense of unease sharpened.

Mica closed her eyes, her senses sharpened in the night.

I let my psychic sense sharpen despite the aura of the grove.

The cat's senses sharpen my own, I told you that.

Being deprived of sight, Frodo found his hearing and other senses sharpened.