to throw down the gauntlet
01
挑戦状を叩きつける, 勝負を挑む
to challenge someone to a fight or competition
idiom
例
When she heard the insults, she threw down the gauntlet and challenged the other person to a fight.
組合は全国ストを呼びかけ、挑戦状を叩きつけた。
挑戦状を叩きつける, 勝負を挑む