The act of something that slips; a slip; a skidding or sudden loosening motion.(noun)
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Use "slipping" in a sentence
"There was real purpose from him this round, he knew what was at stake and no doubt felt the title slipping away from him."
"Wake up your numbers are slipping, is that big bad republican machine too."
"Economists polled by Dow Jones predict it will fall from a 50.9 reading in July to 49.1—slipping, in other words, below the 50 level that indicates expansion."