throw down
US /θroʊ daʊn/
UK /θroʊ daʊn/

1.
发起挑战, 挑战
to challenge someone to a fight or competition
:
•
He decided to throw down the gauntlet and challenge the champion.
他决定发起挑战,挑战冠军。
•
The rival team threw down a challenge for a rematch.
对手队发起了重赛的挑战。