Idiom bahasa Inggris - Idioms in English

Idioms, can you guess their meanings?

1. A penny for your thoughts
2. Add insult to injury
3. A hot potato
4. Once in a blue moon
5. Caught between two stools
6. See eye to eye
7. Hear it on the grapevine
8. Miss the boat
9. Kill two birds with one stone
10. On the ball
11. Cut corners
12. To hear something straight from the horse's mouth
13. Costs an arm and a leg
14. The last straw
15. Take what someone says with a pinch of salt
16. Sit on the fence
17. The best of both worlds
18. Put wool over other people's eyes
19. Feeling a bit under the weather
20. Speak of the devil!

Meanings

1. This idiom is used as a way of asking someone what they are thinking about.
2. When people add insult to injury, they make a bad situation even worse.
3. This idiom is used to speak of an issue (especially in current affairs) which many people are talking about.
4. This is used when something happens very rarely.
5. When someone finds it difficult to choose between two alternatives.
6. This idiom is used to say that two (or more people) agree on something.
7. This means ‘to hear a rumour' about something or someone.
8. This idiom is used to say that someone missed his or her chance at something.
9. This means ‘to do two things at the same time'.
10. When someone understands the situation well.
11. When something is done badly to save money. For example, when someone buys products that are cheap but not of good quality.
12. To hear something from the authoritative source.
13. When something is very expensive.
14. The final problem in a series of problems.
15. This means not to take what someone says too seriously. There is a big possibility that what he/she says is only partly true.
16. This is used when someone does not want to choose or make a decision.
17. All the advantages.
18. This means to deceive someone into thinking well of them.
19. Feeling slightly ill.
20. This expression is used when the person you have just been talking about arrives.

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Courtesy of Elanguest Language School. 
Source:
http://www.englishforums.com/content/lessons/20-most-common-idioms-in-english-and-what-they-mean.htm