Third person singular present tense of 'glout': he/she/it pouts or sulks.
From 'glout' + '-s' (third person singular marker). In English grammar, verbs change form when the subject is he, she, or it.
Grammar is full of tiny changes like this—'I glout, you glout, but he glouts'—and these small differences have stayed almost the same in English for over a thousand years!
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