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A twitcher is a bird-watcher of a very particular kind: not someone who quietly enjoys the birds in their garden, but someone who travels — sometimes hundreds of miles, sometimes overnight — to see a rare bird that has been reported somewhere. The point is to see it and add it to a list. When news goes around that a bird from Asia has landed by accident on a beach in England, the twitchers get in their cars that same day. So the word carries a feeling of obsession, of a hobby taken to an extreme. It is mostly British. In Britain, people who watch birds usually call themselves 'birdwatchers' or 'birders', and 'twitcher' is kept for the chasing kind — birders themselves are quite careful about this difference, and a calm birdwatcher may not be pleased to be called a twitcher. Outside Britain, and in newspapers, the word gets used more loosely for any keen bird-watcher, which is how your dictionary has it. It is not usually an insult, but there is a smile in it — a little teasing, the way we might tease someone who lines up all night for a phone. Note that 'twitcher' can also simply mean a thing or a muscle that twitches, though you will almost never meet that use.
追鳥人、鳥友（指為了看稀有鳥類而到處奔波的賞鳥迷）
組成twitch（抽動、緊張地動一下）+ -er（做這件事的人）。The bird sense is said to come from 1950s Britain: a birder called Howard Medhurst used to arrive at rare-bird sites shivering — twitching — after riding on the back of a friend's motorcycle in the cold, and his friends called him a twitcher. It appears in print from around 1970.
原始詞典資料3 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。
Twitchernoun
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A streamer on the video livestream service Twitch.
- The Twitchers interact with their audiences in multiple ways in order to create communities.
- Some messages warn against not being fooled, and that YouTubers or Twitchers should be somewhat absolved because “it’s their job” (C2), with the “dirty rotten system” (C2) to blame in which “EA decides who get what” (C2). […] Players post messages stressing the differences between themselves and streamers, with “regular folks are forced to earn … wins in fut champs” (C1; C3) while YouTubers or Twitchers “get given wins by their viewers” (C1; C3).
twitchernoun/ˈtwɪt͡ʃə/
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Someone or something that twitches.
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An avid birdwatcher who travels long distances to see rare species, or to add a new species to their personal list; a birder who goes on twitches.
- It is difficult to classify them precisely, but, in roughly ascending order of productivity, we now recognise the purely chance observer, the locality regulars (now recognising that ‘time in’ eventually equals ‘rarity out’), the ringers (particularly when working in groups), the occasional tally-hunter (most of us, if we are honest), the full-time observatory workers (exhibiting the highest standards of discipline) and the growing group of full-blooded rarity collectors (self-styled ‘twitchers’, covering individually up to 30,000 miles in their annual pursuit of ‘lifers’).
- Twitchers are very mobile and may travel great distances to see rare birds, of which they hear through their efficient 'grapevine'.
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。