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

• second-class post
• Second Coming
• second cousin
• second cousins
• second degree
• second degree burn
• second degree murder
• seconde
• seconded
• secondee
• secondees
• seconder
• seconders
• secondes
• second fiddle
• second five-eighth
• second fix
• second fixes
• second floor
• second-floor
• second floors
• second growth
• second growths
• second-guess
• second-guessed