The motion of the centre of resistance of the float of a paddle wheel, or the blade of an oar, through the water horizontally, or the difference between a vessel's actual speed and the speed it would have if the propelling instrument acted upon a solid; also, the velocity, relatively to still water, of the backward current of water produced by the propeller.
From Middle English slyp, slep, slyppe, from Old English slyp, slyppe, slipa, of uncertain origin. Perhaps from Proto-Germanic *sleupaną, possibly connected with Proto-Indo-European *slewb-, *slewbʰ-, from Proto-Indo-European *sel-; or alternatively from Proto-Germanic *slippijaną, from Proto-Indo-European *sleyb-. Compare Old English slūpan, Old English cūslyppe, cūsloppe.
Probably from Middle Dutch slippe or Middle Low German slippe.
Apparently from Middle Low German slippen. Cognate to Dutch slippen, German schlüpfen. Possibly ultimately from Proto-Indo-European *slewbʰ-.
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