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 ?
With this vital information, they can get all sorts of other data and it can cost you dearly. If you get a message about the phone's iOS just ignore it as Apple have told me they never send these messages.
Although HSBC won't charge if you get any payments bounced, it could still cost you dearly.
It is important not to make any mistakes because they can cost you dearly."
The right broker saves you time and money, while the wrong one can cost you dearly. Our goal is to help buyers and sellers connect with the ideal professional for their needs, monitor the process and ensure a positive experience--all at no additional charge to the consumer."
'Cutting costs on your insurance could cost you dearly when on the slopes.'
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