化不開的情緒
這一組就是核心：苦味留在嘴裡，情緒留在心裡。
r · B2
In a way that shows or causes deep sadness, disappointment or anger that has not gone away.
痛苦地；強烈地
核心畫面
Start with the taste. Bitter is the flavour that will not wash out — the food is gone and it is still sitting at the back of your tongue. You can think of bitterly as that staying quality moved onto other things. A feeling that will not rinse away: crying bitterly, complaining bitterly, bitterly disappointed. And a cold that will not let go either, biting at your ears and fingers the way a bitter taste bites the tongue.
先從味道開始想。苦是那種漱不掉的味道：東西早就吞下去了，舌根還留著。「bitterly」可以想成把這個「留著不走」的…更多收起
先從味道開始想。苦是那種漱不掉的味道：東西早就吞下去了，舌根還留著。「bitterly」可以想成把這個「留著不走」的特質搬到別的地方。一種沖不掉的情緒：哭得很傷心、抱怨個不停、失望透頂。還有一種放不開你的冷：咬耳朵、咬手指，就像苦味咬舌頭那樣。From the word’s history
Wiktionary traces bitterly to Old English biterlīċe, that is bitter + -ly. The taste word is the root, and both modern uses still lean on it.
Wiktionary 記錄 bitterly 來自古英文 biterlīċe，也就是 bitter（苦的）加上 -ly。味覺的字是源頭，今天兩個用法都還靠著那個味道在運作。
Wiktionary entry 'bitterly' (adv), etymology_text in packet: 'From Middle English bitterli... from Old English biterlīċe, bitterlīċe (bitterly), equivalent to bitter + -ly.' (kaikki:3f6f69a190036ae4:1016439172)
Two branches
咬人的冷：bitterly cold
同一個「咬」的感覺換了對象：不是咬舌頭，是咬臉和手指。
r · B2
Used in front of 'cold' to say that the cold is extreme and painful — the kind of cold that hurts your face and hands.
刺骨地冷