/ sʌlk; NAmE / verb , noun
■ verb
[ v ] ( disapproving ) to look angry and refuse to speak or smile because you want people to know that you are upset about sth :
He went off to sulk in his room.
■ noun
( BrE also the sulks [ pl. ]) a period of not speaking and being bad-tempered because you are angry about sth :
Jo was in a sulk upstairs.
to have the sulks
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WORD ORIGIN
late 18th cent.: perhaps a back-formation from sulky .