What is the meaning of deaden?

verb

• Make vague or obscure or make (an image) less visible.
  • usage: "muffle the message"
  • synonyms: dampen, damp
• Cut a girdle around so as to kill by interrupting the circulation of water and nutrients.
  • usage: "girdle the plant"
  • synonyms: girdle
• Make vapid or deprive of spirit.
  • usage: "deadened wine"
• Lessen the momentum or velocity of.
  • usage: "deaden a ship's headway"
• Become lifeless, less lively, intense, or active; lose life, force, or vigor.
• Make less lively, intense, or vigorous; impair in vigor, force, activity, or sensation.
  • usage: "Terror blunted her feelings"; "deaden a sound"
  • synonyms: blunt
• Convert (metallic mercury) into a grey powder consisting of minute globules, as by shaking with chalk or fatty oil. .