threw down the gauntlet

• v. 挑战(邀请比赛)

threw down the gauntlet的用法和样例：

例句

用作动词 (v.)

1. The trade unions have thrown down the gauntlet.
   工会已经提出挑战。
2. The fathers challenged the sons to a race.
   那些父亲们向儿子们挑战进行赛跑。