What is the meaning of falter?

noun

• The act of pausing uncertainly.
  • usage: "there was a hesitation in his speech"
  • synonyms: hesitation, waver, faltering

verb

• Be unsure or weak.
  • usage: "Their enthusiasm is faltering"
  • synonyms: waver
• Move hesitatingly, as if about to give way.
  • synonyms: waver
• Walk unsteadily.
  • usage: "The drunk man stumbled about"
  • synonyms: stumble, bumble
• Speak haltingly.
  • usage: "The speaker faltered when he saw his opponent enter the room"
  • synonyms: bumble, stutter, stammer