路上的那個開口
最看得見的一組：核心畫面照字面實現，開口就在柏油路上。
noun · B1
A smaller road that leads off a main road, and the place where it leaves it — for example the exit from a motorway or highway.
岔路口；交流道出口
核心畫面
You can think of a turn-off as the point where something leaves the road it was on. A car is going straight down a highway; there is one gap in the barrier, and after it the car is somewhere else. Interest travels the same way. It runs along happily, then hits one small thing — a smell, a shout, a number on a contract — and goes off. In both pictures the word names the gap, not the journey and not the driver.
可以想成：turn-off 是「離開原本這條路的那個點」。一台車沿著大路直直開，路邊有一個開口，過了那個開口，車就不…更多收起
可以想成：turn-off 是「離開原本這條路的那個點」。一台車沿著大路直直開，路邊有一個開口，過了那個開口，車就不在大路上了。人的興趣也是這樣走的。本來一路順順的，碰到一件小事——一個味道、一句吼、合約上的一個數字——就整個轉開了。兩個畫面裡，這個字指的都是那個「開口」本身，不是路程，也不是開車的人。From the word’s history
Wiktionary's entry for the noun says it is 'Deverbal from turn off.' — that is, the noun was made directly from the verb phrase. 'Turn off' already does both jobs: leaving a road and switching something off. The noun names the point where either kind of turning off happens.
維基詞典在這個名詞底下寫著「Deverbal from turn off.」，意思是它直接從動詞片語 turn off 變成名詞。turn off 本身就同時做兩件事：從路上轉出去，以及把某個東西關掉。名詞 turn-off 指的就是那個「轉開」發生的地方或原因。
Wiktionary entry for turn-off (packet etymology_text: 'Deverbal from turn off.'), source_ref kaikki:3f6f69a190036ae4:1148470569
Two branches
讓興趣轉開的那件事
同一個開口，換到心裡。興趣本來一路往前，遇到那一件事就轉出去了。這是理解上的連結，不是在講歷史先後——不過在這個字上，來源的 deverbal 說明剛好也支持兩邊共用 turn off 這個動詞。
noun · B2
Something that makes you lose interest in a person, a thing, or a plan — especially something that stops you finding someone attractive. The source marks it informal, and it is used in the singular.
讓人瞬間失去興趣的事