cost a pretty penny(redirected from cost them a pretty penny)
cost a pretty penny
To be very expensive. The person spending the money can be stated between "cost" and "a." A fancy car like that costs a pretty penny, so I definitely can't afford it! Wow, a house in that gated community must have cost Alex a pretty penny.
cost a pretty pennyand cost an arm and a leg; cost the earth
Fig. to be expensive; to cost a lot of money. Mary's dress is real silk. It must have cost a pretty penny. Taking care of a fancy car like that can cost a pretty penny, let me tell you. It cost an arm and a leg, so I didn't buy it. A house that size with an ocean view must cost the earth!