itch

Short definition from Wiktionary

Noun

1. 1
   A sensation felt on an area of the skin that causes a person or animal to want to scratch said area.
2. 2
   A constant teasing desire or want.

Verb

1. 1
   To feel itchy; to feel a need to be scratched.
2. 2
   To have a constant, teasing urge; to feel strongly motivated; to want or desire something.
3. 3
   To cause to feel an itch.
4. 4
   To scratch or rub so as to relieve an itch.