big deal
成語所屬單字deal
big deal — 慣用語
1. Used to say that something is very important; often used ironically to show that
1.慣用語
釋義
了不起的事（常帶諷刺意味）
Used to say that something is very important; often used ironically to show that you do not think it matters at all.
例句
She won a small prize in the competition — it was no big deal.