An itch is a feeling of slight physical discomfort somewhere on the body. It’s a sensation similar to–but somewhat less than–pain. The natural response is to rub, scratch, or poke at the area that itches.
If you have an itch, you scratch it.
I have an itch on my back. I need to scratch it.
My back itches.
A mosquito bite will make you itch.
This sweater is making me itch.
The man complained to the doctor that he’s experiencing itching on his hands and feet.
The word "itchy" is an adjective:
If your scalp is itchy, it might be dry.
People with itchy skin can use a lotion or ointment to relieve the discomfort.
I felt all itchy after walking though the woods.
The little girl says she’s itchy because of her rash.
Sometimes the word "itch" is used when a person wants to do something or is inclined to act:
Regina is itching to get married. (She wants to get married.)
William is feeling an itch to invest in real estate. (He wants to invest in real estate.)
The man with the gun has an itchy trigger finger. (This means he’s quick to fire a gun.)