What is the meaning of itch?

noun

• A contagious skin infection caused by the itch mite; characterized by persistent itching and skin irritation.
  • usage: "he has a bad case of the itch"
  • synonyms: scabies
• A strong restless desire.
  • usage: "why this urge to travel"
  • synonyms: urge
• An irritating cutaneous sensation that produces a desire to scratch.
  • synonyms: itchiness, itching

verb

• Scrape or rub as if to relieve itching.
  • usage: "Don't scratch your insect bites"
  • synonyms: rub, scratch
• Have or perceive an itch.
  • usage: "I'm itching-the air is so dry"
• Cause to perceive an itch.
  • usage: "his skin itched"
• Have a strong desire or urge to do something.
  • usage: "She is itching to start the project"; "He is spoiling for a fight"
  • synonyms: spoil