knoll

noun

1. A small mound or rounded hill.

   “grassy knoll”

   “On knoll or hillock rears his crest, / Lonely and huge, the giant oak.”

   “In the northern hemisphere, June 21 has the most daylight hours. Pack a picnic—a chilled bottle of Sancerre, cheese, olives, and a nice baguette—and hit the grassy knoll.”

2. A rounded, underwater hill with a prominence of less than 1,000 metres, which does not breach the water's surface.
3. A knell.

verb

1. (transitive)To ring (a bell) mournfully; to knell.
2. (ambitransitive)To sound (something) like a bell; to knell.

   “If ever been where bells have knoll'd to church.”

   “For a departed being's soul / The death hymn peals, and the hollow bells knoll: [...]”

   “[A]ll that night I heard / The heavy clocks knolling the drowsy hours.”

3. (transitive)To call (someone, to church) by sounding or making a knell (as a bell, a trumpet, etc).

   “Their office now was to guide the monster choruses and Sunday hymns; and like the trumpets of silver made of a whole piece “for the calling of the assembly, and for the journeying of the camps,” to knoll the people in to church.”

   “The parishioners were not, however, to be permanently deprived of this means of grace, and for many a year they have been “knolled to church” by the bells of the Town Hall, a comely building […]”

4. To arrange related objects in parallel or at 90 degree angles.