To advance slowly, as if by inches; SYN. inch.

1. To become sharp or sharper
2. To give a point to; SYN. taper, point.
3. To make more acute; as of one's senses; SYN. heighten.
4. To make sharp or sharper, of images and sounds
5. To make sharp or sharper, as of knives.
6. To make sharp or sharper
7. To raise the pitch of (musical notes).