先把身體弄熱
這一組就是核心畫面本身，還沒有比喻：真的把冷的、硬的身體活動到變熱。
noun · B1
A set of gentle, easy exercises you do before sport, dancing, or hard physical work, so that your body is ready to move well and is less likely to get hurt.
暖身運動
核心畫面
You can think of warm-up as the picture of something cold being brought up to temperature before it is asked to work. A body straight off a cold bench is stiff; ten minutes of easy movement makes it loose and warm, and only then does the real effort begin. Everything the word does keeps that shape: a small, light, low-pressure run at the thing, placed right in front of the thing itself. What gets warmed can change — muscles, a voice, a set of tyres, a quiet audience — but the position never does. It always comes first, and it is always easier than what follows.
「warm-up」可以想成一個畫面：冷的東西先弄熱，才叫它出力。剛從板凳上站起來的身體是硬的，慢慢動個十分鐘就變熱、…更多收起
「warm-up」可以想成一個畫面：冷的東西先弄熱，才叫它出力。剛從板凳上站起來的身體是硬的，慢慢動個十分鐘就變熱、變鬆，這時候才開始真正的運動。這個字所有的用法都保持同一個形狀——在正事前面，先來一個小小的、輕鬆的、沒有壓力的版本。要弄熱的東西可以換：肌肉、聲音、輪胎，甚至是一整場安靜的觀眾。但位置從來不變，它永遠排在前面，而且永遠比後面那件事輕鬆。From the word’s history
The source records warm-up as a deverbal noun — it was made from the verb phrase warm up. The action existed first, and the name was cut out of it afterwards, which is why the noun still carries the whole little event rather than just a thing.
來源記錄 warm-up 是從動詞片語 warm up 直接變成的名詞（deverbal）。也就是說，先有「把身體弄暖」這個動作，名字才從動作裡切出來。這解釋了為什麼這個名詞指的不是一樣東西，而是一整段小事件。
Wiktionary entry for warm-up (packet etymology_text: "Deverbal from warm up."), source_ref kaikki:3f6f69a190036ae4:834403607:12360
Three branches
正式登場前的那一場
把核心畫面從「一個人的身體」放大到「一整件事」：大賽前先來一場小的，作用跟上場前先動一動一樣。
adjective · B1
Used before words like match, game, or race to say that it is played for practice, a short time before the big event that really counts.
熱身賽的
暖身時穿在身上的
再往外一步：暖身這件事的名字，被借去叫做這件事時穿的衣服。這是「以事命名物」的常見走法，不是另一條來源。
noun · B2
Loose, comfortable clothes — usually a jacket and matching trousers — that you put on for exercising, or before and after a game, to keep your body warm.
運動服、暖身服