verb
to look or stare angrily or sullenly
adjective
having an angry or sullen look
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The CEO was glowering at the employees during the meeting, clearly displeased with their performance.
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Why is he glowering at us like that? Did we do something wrong?
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Stop glowering at me, it's making me uncomfortable.
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Dark clouds were glowering in the sky, signaling an incoming storm.