Proverbs :ضرب المثل ها

Curiosity killed the cat.

Meaning:

If you are too interested in things you should not be interested in, you could be in danger. You may be causing yourself problems by trying to find out things you don't need to know.

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Don't count your chickens before they hatch.

Meaning:

You use this proverb to warn someone not to plan anything that depends on a good thing you expect to happen in the future, and tell him/her to wait until it really happens.

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The best advice is found on the pillow.

Meaning:

You use this proverb to say that if you have a difficult problem and cannot find the answer now, just go to bed and have a good night's sleep. You may find it tomorrow morning.

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It's no use crying over spilled (spilt) milk.

Meaning:

You use this proverb to say that you shouldn't worry about something that has already happened.
It is no use being angry over or upset about something that has already happened and/or you cannot change.

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http://humanities.byu.edu/elc/student/idioms/idiomsmain.html