打開東西的那個工具
這一族就是核心畫面最原本的樣子：東西是關著的，手伸過去打不開，於是需要一個專門負責打開的東西。
noun · A2
A tool or small device made for opening something you cannot easily open with your hands — most often cans and bottles, but also letters, and doors that open by machine.
開罐器／開瓶器
核心畫面
Hold the word in two pieces: open, plus -er, the one that does it. So an opener is simply whoever or whatever does the opening. Start with the thing in your hand that gets a closed can open. Then notice that a shut can is not the only thing that needs opening — an evening, a season, a conversation all sit closed until something starts them. Whatever goes first is the thing that opens them.
可以把這個字拆成兩塊看：open 加上 -er，-er 指「做這件事的那一個」。所以 opener 就是「負責打開的…更多收起
可以把這個字拆成兩塊看：open 加上 -er，-er 指「做這件事的那一個」。所以 opener 就是「負責打開的那一個」。先從手上那支工具開始想：罐頭是關著的，開罐器把它打開。接著把「關著的東西」放大一點——一個晚上的表演、一整季的比賽、一段還沒開始的對話，也都像是關著的。誰先上場、哪一場先打、哪一句先說出口，那一個就是把它打開的 opener。工具和「第一個」其實是同一個畫面，只是被打開的東西不一樣。From the word’s history
The source traces opener to Middle English oppinnare and Old English openere, which is open plus the -er ending that forms agent nouns. The shape of the word is still visible today, and it explains why one word covers both a tool and a first item: both of them are the thing that opens.
資料記載 opener 來自中古英文的 oppinnare、古英文的 openere，也就是 open 加上構成「做這件事的人或東西」的字尾 -er。這個組成到今天還看得出來，也正好解釋了為什麼同一個字既是工具也是「第一個」：兩者都是那個負責打開的角色。
Wiktionary entry for opener, etymology 1, supplied in this packet (kaikki:3f6f69a190036ae4:823777371).
Two branches
先上場、先出現的那一個
把「被打開的東西」從罐頭換成一段時間：一季比賽、一場表演、一段對話，在開始之前都還是關著的。第一個出現的，就是把它打開的那一個。
noun · B1
The first game of a season or of a series of games in a sports competition.
開幕戰／首戰
原始詞典資料14 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。
openernoun詞源 1/ˈəʊ.pən.ə/
- 1
A person who opens something.
- Have you, like the opener of this debate, discovered, sapiently enough, that "the peace party, with Lord Aberdeen at their head, were the chief cause of the war"?
- 2
A device that opens something; specifically a tin-opener/can-opener, or a bottle opener.
- 3
An establishment that opens.
- The late-night openers in the mall include two restaurants and a clothing store.
- 4
card-gamesgamesThe player who starts the betting.
- 5
card-gamesgamesCards of sufficient value to enable a player to open the betting.
- 6
artscraftsengineeringA person employed to separate sheets of hot metal that become stuck together.
- 7
entertainmentlifestyletheaterThe first act in a variety show or concert.
- 8
ball-gamescricketgamesA batsman or bowler who normally plays in the first two positions of an innings.
另外 5 個記錄的用法
- 9
The first in a series of events, items etc.; the first remark or sentence of a conversation.
- 10
hobbieslifestylesportsThe first game played in a competition.
- The opener came from a Jarvis ball which struck Aleksandar Kolarov en route to a lively round of pinball between City players before it was poked in by Milijas.
- England were on the scoreboard after only one minute, Wilkinson, who missed five penalties in his side's opener against the Pumas, knocking over a three-pointer from bang in front, despite boos from the crowd.
- 11
hobbieslifestylesportsA opening goal.
- 12
fishinghobbieslifestyleA period of time when it is legal to commercially fish.
- 13
ball-gamesbaseballgamesA pitcher who specializes in getting the first outs of a game before being replaced, either by a long reliever or a pitcher who would normally start.
- The Rays debuted the opener—in which a reliever starts the game and throws anywhere from one to three innings, then gives way to a new pitcher, who will usually throw three to five as essentially a second starter—on May 19 against the Angels, using veteran righty Sergio Romo to pitch the first.
這個拼法也被記錄為下列字的變化形：
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。