How do you spell Knolling

Available Definitions:
1)  n. - A little round hill; a mound; a small elevation of earth; the top or crown of a hill.
2)  v. t. - To ring, as a bell; to strike a knell upon; to toll; to proclaim, or summon, by ringing.
3)  v. i. - To sound, as a bell; to knell.
4)  n. - The tolling of a bell; a knell.