1. floorboard
1.1. a board in the floor
1.1.1. the way is full of floorboard
2. rat
2.1. smell a rat to suspect that something is wrong; to sense that someone has caused something wrong.
2.1.1. I don't think this was an accident. I smell a rat. Bob had something to do with this. The minute I came in, I smelled a rat. Sure enough, I had been robbed.
3. Donkey
3.1. hard, boring work
3.1.1. Why do I have to do all the donkey work while you get to do the interesting stuff?
4. cat
4.1. not have a cat in hell's chance
4.1.1. They haven't a cat in hell's chance of getting over the mountain in weather like this
5. Dog
5.1. go to dogs
5.1.1. if a country or an organization is going to the dogs, it is becoming less successful than it was in the past (usually in continuous tenses)
5.1.1.1. They sat in the bar the night before the election, moaning that the country was going to the dogs.
6. FLOOR
6.1. the ocean floor
7. Butterflies
7.1. have butterflies in your stomach a nervous feeling in one's stomach
7.1.1. She always has butterflies in her stomach before a test
8. cat
8.1. LET THE CAT OUT OF THE BAG to tell people secret information, often without intending to
8.1.1. "Bob didn't want anyone to know he was sick, but his wife let the cat out of the bag."
9. Bull
9.1. take the bull by the horn
9.1.1. to confront a problem head-on and deal with it openly
9.1.1.1. It's time to take the bull by the horns and get this job done.
10. WORLD
10.1. All the time in the world
10.1.1. A lot of time
10.1.1.1. don't be hurry you have all the time in the world
10.2. think the world
10.2.1. great affection and respect for someone
10.2.1.1. I think the world of Gandhi
10.3. out of this world
10.3.1. marvelous", "wonderful
10.3.1.1. How are the clothes this year?" "Terrible. But out of this world
10.4. on top of the world
10.4.1. Feel absolutely fantastic
10.4.1.1. I won the championship I feel on top the world
10.5. worldwide
10.5.1. around the world
10.5.1.1. globalisation is worldwide phenomenon
11. cat
11.1. Curiosity killed the cat Being curious can get you into trouble. (Often used to warn someone against prying into other's affairs.)
11.1.1. Jill: Where did you get all that money? Jane: Curiosity killed the cat.