› a reduction in the level or amount of something: a slip in something The retail group reported a 5% slip in sales. recent slips in the value of the stock market
› a small piece of paper, especially with writing on it: When I gave him his credit card slip, he added a $20 tip. She scribbled a number on a slip of paper and handed it to me.reply/packing slip Packing slips show the retailer's name and address. credit/debit/withdrawal slip
› a mistake: Management made a costly slip by ignoring such obvious warning signs.
slip of the tongue › a small mistake made while speaking: Wall street is nervous, and any slip of the tongue can send markets sliding downhill. → See also compliments slip, deposit slip, pay slip, paying-in slip, pink slip, sales slip, slip-up