The phrase 'pinch pennies' is casual and best used in informal settings like conversations among friends. I can't go to the movies tonight, I'm trying to pinch pennies until payday.
Pro Tip 2/3
Non-literal Phrase
'Pinch pennies' means to be frugal—it doesn't mean literally pinching coins with your fingers. She doesn't really pinch every penny, but she's definitely frugal with her budget.
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Money-Saving Context
Use 'pinch pennies' when talking about saving money or cutting down on expenses. Since we're planning a big trip next year, we need to start pinching pennies now.