IDIOMS - MEANINGS AND EXAMPLES

An idiom is a phrase or expression with a meaning different from the meanings of the individual words.

Below are some examples and their meanings:

as easy as pie: very easy.
"I thought you said this was a difficult problem. It isn't. In fact, it's as easy as pie."

at the eleventh hour: at the last minute; almost too late.
"Yes, I got the work done in time. I finished it at the eleventh hour, but I wasn't late.

beat around the bush: evade an issue; avoid giving a direct answer.
"Quit beating around the bush! If you don't want to go with me, just tell me!"

beat one's brains out: try very hard to understand or do something.
"Can you help me with this problem? I've been beating my brains out with it,but I just can't solve it."

burn the midnight oil: study/work all night or until very, very late at night.
"I'm not ready for the test tomorrow. I guess I'll have to burn the midnight oil."

Source : http://www.eslcafe.com/idioms/