When there is a coup, a group of people seize power in a country.
例句
...a military coup...军事政变They were sentenced to death for their part in April's coup attempt.他们因参与了4月份的政变而被判处死刑。
了不起的成就;成功之举
A coup is an achievement which is thought to be especially good because it was very difficult.
例句
The sale is a big coup for the auction house...这笔交易是该拍卖行的一大成功之举。Regency Opera have scored something of a coup by persuading her to undertake the role.雷根希歌剧院说服她扮演这一角色从而取得了巨大成功。