it's a deal
成語所屬單字deal
it's a deal — 慣用語
1. An informal expression used to confirm that you have reached an agreement with s
1.慣用語
釋義
就這麼說定了（口語用法）
An informal expression used to confirm that you have reached an agreement with someone.
例句
"I'll help you move this weekend if you buy lunch." "It's a deal!"