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Here are the explanations which you required:
Not to mention.......: not leaving something out of a discussion or an argument.
("We must consider her age, not to mention her experience")
He/she ran like hell: He ran very quickly.
You rock!! : You are gorgeous!!
Who knows?: What will happen is anybody's guess.
I am afraid I don't understand.........:I regret to say that I do not understand
It is a good catch: It is something that is an advantageous thing to do/ get (in marriage terms : an advantageous marriage to make)
That's my target: That is my aim.
I'll tell you what: I will tell you exactly what I suggest you/ we do.
Don't get me wrong: Do not put the wrong interpretation on what I am saying.
You are on the right track: What you are doing is correct and you should persevere.
Whatever you say: Have things your own way! I don't care.
Does it ring a bell.? : Does that remind you of anything?
Not that I know of: Not to my knowlege/I am not aware of this.
What's it for? : What use or purpose has that?
A long way to go..........:You still have to do a lot before you reach your goal.
Face it!! : Face the truth/ facts
You could do just as well:. You could achieve the same good results.
Get the hang of..........: to be able to carry out / understand a complex task.
("I cannot get the hang of this"": I do not comprehend how to do this")
Let's call it a day: Let's us stop now, we can go no further or we cannot achieve any more today.
I was stuck in the ...... all day: I had to stay there and could not leave at any time that day.
Get it over with: to finish or complete a difficult task, or put an unpleasant experience or ordeal behind one.
("I need this operation and want to get it over with")
Hey!! Check this out!!: Hey(exclamation)!!! Verify this!
Stormed out of .............(a place): left in a rage out of a place
Apologies, I was interrupted by a student and could not complete this as I intended an hour ago.
For a list of typical English idioms, see:
http://www.usingenglish.com/reference/idioms/
They are in alphabetical order. Click on the letters in the A-Z for subsequent expressions.
There is also a Dictionary of English Slang, which is protected by copyright, but which you can consult for your own use:
http://www.peevish.co.uk/slang/
I hope that you find this helpful.