主辦・主持（動詞）
這一族就是把上面「當主人」的名詞變成動作——做主人這件事本身。
host (an event) · verb · B2
To give the place and everything needed for an event, and look after the people who come.
主辦 / 舉辦
核心畫面
You can picture host as the person who opens their door, welcomes you in, and takes care of you — they have the place, and you are the guest in it. From that one picture grows almost everything: whoever owns the space and looks after the people in it is the host, whether it's a home, a TV studio, a whole country, or even a living body that something else lives inside.
可以把 host 想成那個打開家門、把你迎進來、然後一路照顧你的人：場子是他的，你是他的客人。核心畫面比較像「我有這…更多收起
可以把 host 想成那個打開家門、把你迎進來、然後一路照顧你的人：場子是他的，你是他的客人。核心畫面比較像「我有這個地方，我把人請進來、招呼好」——從這一個畫面幾乎長出所有用法：誰擁有那個空間、又負責照顧裡面的人，誰就是 host，不管那是一個家、一個電視棚、一整個國家，甚至是一具被別的生物住進去的身體。From the word’s history
Latin hospes 'host, guest' gives the core (host/guest were once two sides of one word); the 'a host of / multitude' sense is a different word, Latin hostis 'army, enemy'; the Communion-bread sense is yet another, Latin hostia 'sacrificial victim'.
招待客人的 host 來自拉丁文 hospes（主人／客人，本是一體兩面）；表示「一大群」的 host 其實是另一個字，來自拉丁文 hostis（軍隊、敵人）；聖體那個 host 又是第三個來源，拉丁文 hostia（獻祭的祭品）。三條線剛好撞成同一個拼法。
Online Etymology Dictionary (etymonline.com), entries for host (n.1), host (n.2), host (n.3)
From the picture
一大群（另一個來源）
這個意思跟「主人」沒有關係，別硬把它接回核心畫面。
a host of (a large number) · noun · B2
A very large number of people or things, often used as 'a whole host of'.
一大群 / 許多
聖體・聖餅（又一個來源）
這個意思同樣不是從「主人」延伸出來的，不要替它編一個假的關聯。
the Host (Communion bread) · noun · B2
In some Christian churches, the special bread used in the religious meal called Communion.
聖體 / 聖餅
Also in this word
host (party) · noun · B2
The person who invites people to a party or meal and looks after them, giving them food and drinks.
主人 / 東道主
host (TV/radio presenter) · noun · B2
The person on a TV or radio show who talks to the guests and tells the audience what happens next.
主持人
host (country/city of an event) · noun · B2
A country, city, or group that gives the space and things needed for a big event, like a sports game or meeting.
主辦方 / 東道主
host (organism a parasite lives on) · noun · B2
An animal or plant that a smaller living thing lives on or inside, taking food from it.
宿主 / 寄主
原始詞典資料15 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
hostnoun詞源 1/həʊst/
- 1
One which receives or entertains a guest, socially, commercially, or officially.
- A good host is always considerate of the guest’s needs.
- Time is like a fashionable host, / That slightly shakes his parting guest by the hand.
- 2
One that provides a facility for an event.
- 3
A person or organization responsible for running an event.
- Our company is host of the annual conference this year.
- 4
A moderator or master of ceremonies for a performance.
- The host was terrible, but the acts themselves were good.
- 5
The primary member of a system, typically the member who fronts most often.
- 6
computingengineeringmathematicsAny computer attached to a network.
- 7
biologyecologynatural-sciencesA cell or organism which harbors another organism or biological entity, usually a parasite.
- Viruses depend on the host that they infect in order to be able to reproduce.
- A recent study explored the ecological variables that may contribute to bats’ propensity to harbor such zoonotic diseases by comparing them with another order of common reservoir hosts: rodents.
- 8
biologygeneticsmedicineAn organism bearing certain genetic material, with respect to its cells.
- The so-called junk DNA is known, so far, to provide no apparent benefit to its host.
另外 1 個記錄的用法
- 9
A paid male companion offering conversation and in some cases sex, as in certain types of bar in Japan.
hostverb詞源 1/həʊst/
- 1
To perform the role of a host.
- Our company will host the annual conference this year.
- I was terrible at hosting that show.
- 2
obsoleteTo lodge at an inn.
- Where you shall host.
- 3
computingengineeringmathematicsTo run software made available to a remote user or process.
- Kremvax hosts a variety of services.
- CMU/TEK TCP/IP software uses an excessive amount of cpu resources for terminal support both outbound, when accessing another system, and inbound, when the local system is hosting a session.
hostnoun詞源 2/həʊst/
- 1
A multitude of people arrayed as an army; used also in religious senses, as: Heavenly host (of angels)
- Why, Plugson, even thy own host is all in mutiny: Cotton is conquered; but the ‘bare backs’ — are worse covered than ever!
- All about the hosts of Mordor raged.
- 2
A large number of items; a large inventory.
- The dealer stocks a host of parts for my Model A.
- There are a host of reasons for this decision.
hostnoun詞源 3/həʊst/
- 1
ChristianityThe consecrated bread of the Eucharist.
- Do you pray to the Holy Ghost when you suck your host? / Do you read who's dead in the Irish Post?
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。