scrimp and save
To spend as little money as possible; to be especially frugal, especially with the aim of saving up for something bigger. Ever since we had our second child, we've had to scrimp and save to make sure they both get what they want for Christmas.
skimp and save
To reduce or limit one's spending in order to save money. I'd love to go out to dinner with you, but I'm really skimping and saving right now. I'm sorry, honey, but your father and I can't afford to buy you a new bike right now—you'll have to work more hours and skimp and save.
scrimp and save
and pinch and scrapeto be very thrifty; to live on very little money, often in order to save up for something. We had to scrimp and save in order to send the children to college. The Smiths pinched and scraped all year in order to go on a Caribbean cruise.
scrimp and save
Economize severely, spend as little as possible, as in For years we had to scrimp and save, but now we can enjoy life more. [Mid-1800s]