Glower means to look angry or sullen, typically to signal disapproval.
Glower most nearly means to look angry or sullen as if to signal disapproval, displaying a mean or bad-tempered demeanor. This is often shown through a scowl or a glare at someone or something. A scowl is a facial expression that conveys displeasure, annoyance, or anger, which is synonymous with glowering.
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