Definitions
1.NounA small mound or rounded hill."grassy knoll"
2.NounA rounded, underwater hill with a prominence of less than 1,000 metres, which does not breach the water's surface.
3.NounA knell.
4.VerbTo ring (a bell) mournfully; to knell.
5.VerbTo sound (something) like a bell; to knell.
6.VerbTo call (someone, to church) by sounding or making a knell (as a bell, a trumpet, etc).
7.VerbTo arrange related objects in parallel or at 90 degree angles.