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

1.
高い代償を払う, ひどい目に遭う
to suffer greatly as a result of something you have done
:
•
He will pay dearly for his mistakes.
彼は自分の過ちに対して高い代償を払うだろう。
•
If you betray their trust, you will pay dearly.
彼らの信頼を裏切れば、高い代償を払うことになるだろう。