pick/take up the gauntlet

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

   你做好应战准备了吗？

run the gauntlet

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

   他遭到报纸的抨击。

throw down the gauntlet

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

   工会已经提出挑战。

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