Picture anger with the sound switched off. Someone is upset, but instead of shouting or explaining, they close their face, answer in one word, and take themselves to the edge of the room. The silence is doing the talking, and everyone present can feel it. That one picture covers all three uses: the behaviour itself is the verb, the stretch of time it fills is the noun, and the person who keeps doing it is the third use. Because the word already suggests that words would have been better, it always carries a little .
From the word’s history
The packet's Wiktionary entry calls sulk a back-formation from sulky and says the origin is uncertain, possibly connected to an Old English word for being slow, slack or without energy. Because the source itself is unsure, this is offered as a thread, not a fact.
packet 裡的 Wiktionary 說 sulk 可能是從形容詞 sulky 倒推出來的動詞，而且明講來源不確定，往上也許連到古英文表示「遲鈍、提不起勁」的字。既然來源本身有疑問，這裡只當一條線索看，不當定論。
Wiktionary entry supplied in packet (source_ref kaikki:3f6f69a190036ae4:676148548), which states the origin is uncertain
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