an illegal market in which goods or currencies are bought and sold in violation of rationing or controls
turn the corner
if something or someone turns the corner, their situation starts to improve after a difficult period
An unaccountable sum of money available for questionable to corrupt purposes. "He...piled up an enormous 'slush fund' for a 'campaign of education.'..."
an informant who exposes wrongdoing within an organization in the hope of stopping it
bite the bullet
Mean to endure a painful, unpleasant situation courageously. To face up to adversity.
If you give or show someone the cold shoulder, you are deliberately unfriendly and unco-operative towards them.
the proof is in the pudding
you can't judge something good or bad until you try it....or try it and you will see the result.