glowered

Reader's Digest １1月号のSTAFF PICK記事に今年の９月に行った英国のBath市が出て来ました。
I was in Bath, UK, for the chrismas lights ceremony a few years ago and stopped in at the Highgrove shop.
I noticed an unusual fuss at the till; it was Camilla, Duchess of Cornwall, chatting merrily with shoppers as her ignored security team glowered behind her. That relaxed charisma comes shining through in "Camilla".
・Cambridge English Dictionary: to look very angry, annoyed, or threatening: There's no point glowering at me like that - you know the rules.
・Vocabulary.com: If you see someone glower at you, you might consider glowering back, but no one likes an angry staring contest. To glower is not only to stare, it's to stare angrily, as if you're going to throttle someone.
You might already have guessed that glower isn't of Greek or Latin origin, since it doesn't ring any of those bells. Chances are that glower comes from northern Europe, where it's related to some old words that mean to "glow." It was probably in the 18th century that it took on the meaning "stare at angrily or sullenly." You can use its root, glo, to recall its meaning: a person that glowers seems to glow with anger.
今日覚えたい単語は上に出てきた "glower" でした。