throw down the gauntlet

US /θroʊ daʊn ðə ˈɡɔːnt.lət/
UK /θroʊ daʊn ðə ˈɡɔːnt.lət/
"throw down the gauntlet" picture
1.

發出挑戰, 下戰書

to issue a challenge or an invitation to fight or compete

:
The rival company threw down the gauntlet by launching a new product with superior features.
競爭對手公司通過推出具有卓越功能的新產品發出了挑戰
He threw down the gauntlet, daring anyone to beat his record.
發出了挑戰,敢於任何人打破他的記錄。