To cost dear

to require or occasion a large outlay of money, or much labor, self-denial, suffering, etc.

See also: Cost

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Silly penalties - the bane of Coventry's season - threatened to cost dear as Sheffield went on a five-on-three powerplay and Mathieu Roy tipped home from Ben O'Connor.
But, with just seconds remaining, the missing maturity in the performance came to the fore to cost dear as the ball was lost in attack when the possession kings could have easily kept hold of the game.