名詞 itch:

1. a contagious skin infection caused by the itch mite; characterized by persistent itching and skin irritation
   同義詞：scabies
2. a strong restless desire
   同義詞：urge
3. an irritating cutaneous sensation that produces a desire to scratch
   同義詞：itchiness, itching

動(dòng)詞 itch:

1. scrape or rub as if to relieve itching
   同義詞：rub, scratch
2. have or perceive an itch
3. have a strong desire or urge to do something
   同義詞：spoil

1. His fingers itch for a fray.
   他的手指發(fā)癢，想要打架。
2. He has an itch for money.
   他渴望發(fā)財(cái)。
3. Are your mosquito bites still itching?
   你被蚊子咬的地方還在癢嗎？
4. The boys were itching for the lesson to end.
   那些男孩子們渴望下課。

itch

n.（名詞）
An irritating skin sensation causing a desire to scratch.
癢：讓人想去搔的一種煩人的皮膚感覺
Any of various skin disorders, such as scabies, marked by intense irritation and itching.
疥癬，皮癬：一種皮膚病，如疥瘡，其癥狀是特別的煩躁和發(fā)癢
A restless desire or craving for something:
渴望，熱望，欲望：無休止的欲望和想要得到某物：
例句：
an itch to travel.
渴望旅行

v.（動(dòng)詞）
itched,itch.ing,itch.es
v.intr.（不及物動(dòng)詞）

To feel, have, or produce an itch.
發(fā)癢：感到癢、使人發(fā)癢或發(fā)癢
To have a desire to scratch.
抓癢：想要抓撓
To have a persistent, restless craving.
渴望：有持久的、永不停止的渴望
v.tr.（及物動(dòng)詞）
To cause to itch.
使發(fā)癢
To scratch (an itch).
抓癢：去搔（身上的癢處）

來源：
Middle English yicche
中古英語 yicche
from Old English gicce
源自 古英語 gicce
from giccan [to itch]
源自 giccan [搔癢]