A proverb (from Latin: proverbium) is a simple and concrete saying, popularly known and repeated, that expresses a truth based on common sense or experience. They are often metaphorical. A proverb that describes a basic rule of conduct may also be known as a maxim. Proverbs fall into the category of formulaic language.
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Don't count your chickens before they're hatched.
Don't cross a bridge before you come to it.
Don't cut off your nose to spite your face.
Don't fall before you're pushed.
Don't have too many irons in the fire.
Don't judge a book by its cover.
Don't look a gift horse in the mouth.
Don't make a mountain out of a molehill.
Don't make clothes for a not yet born baby.
Don't mend what ain't broken.
Do not play with edged tools.
Doctors make the worst patients.
Discretion is the better part of valor.
Do unto others as you would have them do unto you.
Don't carry coals to Newcastle.