bell the cat

1. 为别人冒险
   All the workers agreed that they wanted a pay increase, but nobody offered to bell the cat and talked to their employer.

   所有的工人都认为要加薪，但却没人自告奋勇去跟老板谈。

let the cat out of the bag

1. 泄漏秘密
   The criminal was hiding away from the police, but a small boy let the cat out of the bag when he told the police that there was a man in the house.

   罪犯正躲避警方的搜查，但一位小男孩泄漏了秘密，他告诉警方屋里有一个男人。

rain cats and dogs

1. 下倾盆大雨
   It rains cats and dogs here during the spring.

   春季这里会下倾盆大雨。

   It's raining cats and dogs outside.

   外面正下着倾盆大雨。

• the cat's pyjamas (or the cat's meow)
  chiefly N. Amer. another term for the cat's whiskers (see cat's whisker).
• let the cat out of the bag
  informal reveal a secret carelessly or by mistake.
• like a cat on a hot tin roof (Brit. also on hot bricks)
  informal very agitated or anxious.
• not have a cat in hell's chance
  informal have no chance at all.
• put (or set) the cat among the pigeons
  Brit. say or do something likely to cause trouble or controversy.
• see which way the cat jumps
  informal see what direction events are taking before committing oneself.