pick/take up the gauntlet

1. 應戰
   Are you ready to pick up the gauntlet?

   你做好應戰準備了嗎？

run the gauntlet

1. 受攻擊
   He ran the gauntlet of newspaper attacks.

   他遭到報紙的抨擊。

throw down the gauntlet

1. 挑戰
   The trade unions have thrown down the gauntlet.

   工會已經提出挑戰。

• take up (or throw down) the gauntlet
  accept (or issue) a challenge.