Not know
Slip
Slip verb - To decline gradually from a standard level.
Both terms in one sentence
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Most commercial airline pilots would not know how to perform a forward slip.
Source: Improbable Piloting Skills - We do not know of Riddle's actions during the first war, however, we DO know that when the time was right, he would give the order for Lucius Malfoy to slip the Horcrux Diary into Hogwarts, and bring Hogwarts down from the inside.
Cite this Source
Slip and Not know. (2016). Retrieved 2026, August 13, from https://thesaurus.plus/related/not_know/slip
Not know & Slip. N.p., 2016. Web. 13 Aug. 2026. <https://thesaurus.plus/related/not_know/slip>.
Slip or Not know. 2016. Accessed August 13, 2026. https://thesaurus.plus/related/not_know/slip.
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