名词

1. 伞；雨伞；阳伞
An umbrella is an object which you use to protect yourself from the rain or hot sun. It consists of a long stick with a folding frame covered in cloth.

2. 综合团体；总称；统称
Umbrella is used to refer to a single group or description that includes a lot of different organizations or ideas.

3. 保护伞（指保护某个国家或群体的体制或协议）
Umbrella is used to refer to a system or agreement which protects a country or group of people.

1. having the function of uniting a group of similar things

e.g. the Democratic Party is an umbrella for many liberal groups
under the umbrella of capitalism

2. a formation of military planes maintained over ground operations or targets

e.g. an air umbrella over England

3. a lightweight handheld collapsible canopy