cost (someone) dearly

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cost (someone) dearly

To cause dire, harmful, or problematic consequences for someone, especially regarding a foolish action or a mistake. Drinking all night before his final exams is going to cost him dearly. That late penalty could cost them dearly, as it now puts their opponents within range to tie the game.
See also: cost, dearly
References in periodicals archive ?
Mistakes while driving can't be prevented completely but if there is realisation that carelessness and recklessness can cost one dearly, all motorists will take extra care.
At the DGC, where the fairways are lined by trees and the use of drivers may cost one dearly, Kim looked unfazed by the challenges of the course and sank five birdies on a day when play got delayed due to early morning fog.