idiom
penny wise, pound foolish
小心使用少量的钱,但对大量的钱不小心
Meaning
being careful with small amounts of money but careless with large amounts
Example
She refuses to buy a $10 book, but spends $100 on clothes; she's **penny wise, pound foolish**.
她拒绝买一本10美元的书,却在衣服上花100美元;她是**penny wise, pound foolish**。