plummet /plumˈit/

To plunge headlong

To fathom, sound

1. A leaden or other weight, esp on a plumb line, sounding-line, or fishing-line
2. A plumb rule

• cup marks
• cupmen
• cup moss
• cup of assay
• cupola
• cupola'd
• cupolaed
• cupolaing
• cupolar
• cupolas
• cupolated
• cuppa
• cuppas
• cupped
• cupper
• cuppers
• cupping
• cupping-glass
• cupping-glasses
• cuppings
• cuprammonium
• cuprammonium rayon
• cuprammoniums
• cuprate
• cupreous