a mood or display of sullen aloofness or withdrawal; "stayed home in a sulk" be in a huff and display one's displeasure; "She is pouting because she didn't get what she wanted
If you sulk, you are silent and bad-tempered for a while because you are annoyed about something. He turned his back and sulked. Sulk is also a noun. He went off in a sulk Now she must be tired of my sulks. to be silently angry and refuse to be friendly or discuss what is annoying or upsetting you - used to show disapproval (sulky). a time when someone is sulking in/into a sulk
sulks
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[ 's&lk ] (intransitive verb.) 1781. back-formation from sulky.