坐下來歇一會兒
這一條離核心畫面最近：坐下的第一個好處就是身體可以停下來。
noun · B1
A short rest that you take by sitting down, especially when you are tired from standing, walking, or carrying things.
坐一下休息
核心畫面
Think of the moment someone stops moving around and lowers themselves onto a chair. Standing means you are still on your way somewhere and can leave at any second; sitting means you have put yourself in one place and you are staying there for a while. Every meaning of sit-down comes from something that change makes possible — resting, eating properly, talking properly, or refusing to move.
「sit-down」可以想成一個很小的動作被放大來看：一個人停止走動，把身體放到椅子上。站著的時候，你其實還在路上，…更多收起
「sit-down」可以想成一個很小的動作被放大來看：一個人停止走動，把身體放到椅子上。站著的時候，你其實還在路上，隨時可以走；一坐下來，你就把自己放在同一個地方，而且打算待一會兒。這個字的每一個意思，都是從「坐下之後才做得到的事」長出來的——歇一口氣、好好吃一頓、好好談一次，或者坐著不走。From the word’s history
The source records this word as deverbal from the phrasal verb sit down: the action was turned into a thing and into a describing word.
來源把這個字記為從動詞片語 sit down 直接轉過來的（deverbal）：先有「坐下」這個動作，再把它當成一件事物、一種樣子來用，所以 a sit-down 和 a sit-down meal 的核心都還是那個動作本身。
Wiktionary (kaikki extract) sit-down: etymology_text 'Deverbal from sit down.'
Three branches
坐下來好好進行的一件事
人坐下來，就有時間了。這一條把「坐下」當成一個訊號：這件事不是隨便應付，是要花時間做完的。
adjective · B1
Used about a meal, a dinner, or a restaurant where people sit at a table and are served a full, proper meal, instead of standing up, walking around, or eating something quick.
坐著用餐的
坐下來就不走
這一條用的是核心畫面的另一面：坐下來的人很難被請走，於是「坐著」本身變成一種力量。
adjective · B2
In 'sit-down strike' and 'sit-down protest': a protest in which people sit down in a workplace, a road, or another public place and refuse to move until what they are asking for is listened to or agreed to.
靜坐（罷工／抗議）