to look very angry, annoyed, or threatening怒视;虎视眈眈;咄咄逼人地盯着
There's no point glowering at me like that - you know the rules.你用这种威胁的目光看我毫无意义——你是知道规则的。
figurative Large, black rain clouds glowered (= looked likely to produce rain) in the sky.大团大团的乌云密布空中。