psilord wrote:Ah I see. I should be more specific, I mean an idiomatic expressions like: "Using a hammer to crack a nut.", "The early bird catches the worm.", and "Walk on thin ice."
You have mixed proverbs in a bit, I think.
For idioms like "walk on thin ice" you'll want to pay close attention to your dictionary. A good dictionary like the L&S at Perseus, or the Cunliffe for Homer, will list set phrases, formulas, idioms and even proverbial expressions. Learn to linger over your dictionary, and you'll learn many subtle things.
There are some proverbs/idioms whose meaning is lost to us. One of my favorites is from Hesiod, Theogony line 35:
[face=spionic]a)lla\ ti/h moi tau=ta peri\ dru=n h)\ peri\ pe/trhn;[/face]
Literally, "but why
to me these things around oak or around rock?"
I'm not sure anyone has the first clue what this means. It generates papers like you wouldn't believe.