Gozunu karartmak. 

What does this mean, anyone please?

take a leap of faith

my try

What a coincidence! Just yesterday I wanted to express this in English. I couldn´t. But I´m pretty sure there´s a word for this in English.

It does not mean taking a leap of faith.

It literally means "to darken one´s eye." But it is an idiom. If "you´ve darkened your eye" it means you´re ready for the negative consequences of your action. Maybe you´re going to kill someone, even though you know if you do that you´re going to be jail. Maybe you couldn´t ask her out, because you were afraid of rejection. But now that you´ve darkened your eye you are going to ask her out, and you´re ready for the rejection.

Thank you Olphon.

What about Kifayetsiz kalmak?

Inadequate 

Yes it means inadequate.

"Kifayet" apparently means sufficiency. Our Arabic friends here would probably confirm it.

It´s never used in Turkish anymore, except for the phrase "kifayetsiz kalmak." And that phrase is almost always used for "words": "kelimelerin kifayetsiz kalması"

"Manzaranın güzelliğini karşısında kelimeler kifayetsiz kalıyor."

Literally, "in front of the beauty of this scene, words remain inadequate."

"Words can´t describe how beautiful the view is."

bu kadar kâfî

or

bu kadar kifâyet eder.

meaning,

that´s enough.

i think it is still in use, at least i use.

Of course! "Kafi" is still used. Even I occasionally use it. But I have noticed the connection between "kafi" and "kifayet" just now, thanks to ikicihan.

Rule of thumb: Arabic words in Turkish are fading away if they have a synonym. An example: teferruat - ayrıntı - detay (They all mean "detail", so "teferruat" is becoming less popular.) I guess they have a better chance of surviving if they are a part of a colloquial phrase. Another example like "kifayetsiz kalmak" would be "irtifa kaybetmek."

To me, it seems that only old people and lawyers use Arabic words extensively. I never use "kifayet" (except for the phrase "kifayetsiz kalmak"), and I haven´t heard any of my friends use it. We use "kafi", but just as a parody of old people . My younger cousin, for example, she probably doesn´t even know "kafi." Whereas my grandmother, she wouldn´t use anything other than "kafi."

If you already speak Arabic well, trying to learn these words could instantly give you a huge vocabulary. Other than that... Meeeh... I wouldn´t bother learning them.

it´s very usefull place to learn words ,but how can i talk or use this words i learned