嘴唇閉緊：火氣和話都關在裡面
兩個意思共用同一個畫面，差別只在於被擋住的是情緒還是資訊。
adjective · B2
Pressing your lips firmly together so that your mouth is a thin line, because you are angry and are holding the anger in.
抿著嘴（因為生氣）
核心畫面
Picture a mouth pressed shut so hard that the lips almost vanish into a thin line. Whatever is inside stays inside. Sometimes what is being held back is anger; sometimes it is a piece of news other people badly want. Both uses of the word share that one face.
tight-lipped 可以想成一張抿得死緊的嘴：嘴唇壓成一條細線，裡面的東西一點都漏不出來。被壓在後面的，有時候…更多收起
tight-lipped 可以想成一張抿得死緊的嘴：嘴唇壓成一條細線，裡面的東西一點都漏不出來。被壓在後面的，有時候是一股火氣，有時候是一件別人很想知道的事。兩種用法其實共用同一張臉——東西還在裡面，只是被嘴唇擋住了。From the word’s history
The word is simply tight plus lipped, so the picture of a tightly closed mouth is built into the spelling.
這個字就是 tight（緊）加上 lipped（有嘴唇的）組成的，所以「嘴唇閉緊」這個畫面本來就寫在字裡，不必另外記。
Wiktionary entry for tight-lipped: "From tight + lipped." (kaikki:3f6f69a190036ae4:1334941386)
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