knoll 2 
(nōl) Archaic
(nōl) Archaic v. knolled, knoll·ing, knolls
v.intr.
To ring mournfully; knell.
v.tr.
To ring or sound (a bell, for example) mournfully; knell.
n.
A knell.
[Middle English knollen, probably alteration of knellen, to knell; see KNELL.]