itch

itch /'ɪtʃ/ (itches itching itched)
1 [VERB] V, V-ing
When a part of your body itches, you have an unpleasant feeling on your skin that makes you want to scratch.
When someone has hayfever, the eyes and nose will stream and itch...
...dry, itching skin.
[N-COUNT]
Itch is also a noun.
Scratch my back-I've got an itch.
itching [N-UNCOUNT]
It may be that the itching is caused by contact with irritant material.
2 [VERB] usu cont, V to-inf, V for n
If you are itching to do something, you are very eager or impatient to do it. (INFORMAL)
I was itching to get involved and to bring my own theories into practice...
The general was itching for a fight.
[N-SING] usu N to-inf
Itch is also a noun.
...viewers with an insatiable itch to switch channels.