1 C1 慣用的 フォーマル
それまで友人や味方だった相手を急に攻撃したり、怒って言葉をぶつけたりすること。
"The crowd, once supportive, turned upon the speaker when his lies were exposed."
“
The dog turned upon its master without warning.
— Traditional cautionary expression; widely used in 19th-century literature
分離不可