pay dearly
US /peɪ ˈdɪrli/
UK /peɪ ˈdɪrli/

1.
payer cher, en payer le prix fort
to suffer greatly as a result of something you have done
:
•
He will pay dearly for his mistakes.
Il va payer cher ses erreurs.
•
If you betray their trust, you will pay dearly.
Si tu trahis leur confiance, tu vas payer cher.