From Longman Dictionary of Contemporary Englishsulksulk1 /sʌlk/ verb [intransitive] BAD-TEMPEREDto be silently angry and refuse to be friendly or discuss what is annoying or upsetting you – used to show disapproval Nicola sulked all morning.→ See Verb table
Examples from the Corpus
sulk• No, on second thoughts, I wasn't sulking.• What are you sulking about now?• You can't sit around sulking all day.• Madeleine, however, did not sulk for long.• He sulked, grateful only that he had not insisted on the iron mask, but had chosen the velvet one.• Mitchell could have sulked his way out of the league, which happens frequently.• It hurts, you know, but he wouldn't want me to sulk on it.• Tony was humming to himself as he drove along but Freddie sat silent, sulking over the raid that never was.• Cindy always sulks when I won't buy her any candy.sulksulk2 noun [countable] BAD-TEMPEREDa time when someone is sulkingin/into a sulk Mike could go into a sulk that would last for days. She’s having a sulk.the sulks a fit of the sulksExamples from the Corpus
sulk• The attendant, now adding a sulk to his sullenness, had shuffled off to the kitchen area.• His scowl wedded to her sulks, eh?• But it was silly to go into a major sulk.• His face was sallow, his lips curled down in a perpetual sulk.in/into a sulk• I am in a sulk, a stormy silence, I hardly know why.• The firm lips pouted in a sulk.Origin sulk (1700-1800) sulky 