Tell me the meaning of these new words: enthusiasts, fans, grassroots, and neets.

1. Fans refer to people who have extreme and uncontrollable love and support for certain sports clubs, people, groups, companies, products, artworks, beliefs or fashion trends.

2. Fans, the idolized language' fans' is a transliteration of English' fans' (meaning fanaticism and love, later extended to fans, idolization, etc.).

3. "co gē n" is literally translated from English grass roots. Some people think that it has two meanings: first, it refers to the power relative to the government or decision makers, which is closely related to ideology. People usually refer to some non-governmental organizations, non-governmental organizations, etc., which can generally be considered as "grassroots". Some scholars call non-governmental organizations (also known as unofficial organizations, that is, NGOs) grassroots people's organizations; Another meaning refers to the disadvantaged class corresponding to the mainstream, elite culture or elite class. For example, the culture, customs or activities of some people who are not paid much attention to and ordinary citizens. For example, in the action plans of Taiwan Province Province and Democratic Progressive Party, there is such a statement: "Encourage grassroots culture, protect cultural property and folk skills, strengthen roving exhibitions and performances, and balance the cultural development between urban and rural areas."

4. Acupuncture the elderly is also called "eating the elderly" or "getting close to the elderly". They are not unable to find it, but voluntarily give up employment opportunities and stay at home. They not only depend on their parents for food, clothing, housing and transportation, but also often spend a lot of money.