According to "merriam dictionary", IDIOM is an expression that cannot be understood from the meanings of its separate words but must be learned as a whole.
16 COMMON USED IDIOMS AND THEIR MEANING
A blessing in disguise -happens unexpectedly
Action speaks louder than words -it is better to do than just to talk about it
Apple of my eye -someone who is favorite among others
Beat around the bush -avoiding the main topic
Bite your tongue -to avoid talking
Bring home the bacon -bring the success
Cost an arm and leg -only use when something is
very expensive
Dry run -rehearsal
Finger linckin’ good -very tasty food or meal
Get over it -to move beyond from
something that bothers you
something that bothers you
Good Samaritan -someone who helps others wholeheartedly.No thought of reward
It’s a small word -you see the people in different
place, frequently
place, frequently
Kill two birds at one stone -finish two different things at
a time
a time
Lend me your ear -to politely ask for someone’s
full attention
full attention
Make a long story short -come to the point
Once in a blue moon -happens rarely
Source : http://www.smart-words.org/quotes-sayings/english-idioms-commonly-used.pdf
http://www.idiomsite.com/index3.htm
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