verbs
scrape or rub as if to relieve itching
"Don't scratch your insect bites!"
have or perceive an itch
"I'm itching--the air is so dry!"
is a type of (narrower)
be the source of pain
cause to perceive an itch
"his skin itched"
have a strong desire or urge to do something
"She is itching to start the project"; "He is spoiling for a fight"